FMF Minerals Gallery

Calcita
Morocco
5 x 4 cm (Author: phrancko)

Calcita
Morocco

Calcita
Montjuïc, Barcelona city, Comarca Barcelonès, Barcelona, Catalonia / Catalunya, Spain
5 x 5 x 3 cm (Author: karbu8)

Calcita
Montjuïc, Barcelona c

Calcite Huanggangliang Fe mine, Kèshíkèténg Qí, Chifeng Prefecture, Inner Mongolia A.R., China 107 x 94 x 80 mm Pink rhombs of Calcite to 54 mm perched on matrix covered with flat plates of white Calcite. (Author: GneissWare)

Calcite Huanggangliang Fe mine, K

Calcite Kushikino Mine, Kagoshima Prefecture, Japan 41.0 x 26.0 x 15.0 mm Superb butterfly twin of Calcite measuring 41 x 19 x 11 mm perched on a shard of limonite-coated matrix from the Kushikino Mine, a closed gold-silver mine famous to Japanese collectors for these twins. No damage. (Author: GneissWare)

Calcite Kushikino Mine, Kagoshima

Calcite Meikle Mine (1450 Level), Bootstrap District, Elko County, Nevada, USA 54 x 39 x 26 mm Pale yellowish twinned crystal of Calcite to 23 mm rests on a plate covered with water-clear, modified scalenohedrons of Calcite. The large Calcite has promnent twin lines. It was collected by Casey Jones in August 1998. No damage. (Author: GneissWare)

Calcite Meikle Mine (1450 Level),

Calcite ? ("Former Soviet Union") Height 70 mm (Author: Tobi)

Calcite ? ("Former Soviet Uni

Calcite Aghbar Mine, Bou Azzer District, Ouarzazate Province, Morocco 5.5 x 6.3 cm. Who can resist the hot pink color of these calcites. (Author: crosstimber)

Calcite Aghbar Mine, Bou Azzer Dis

Calcite Agoudal mine, Agoudal, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco, Africa. 9 x 9 x 4 cm; 203 gram (Author: Louis Friend)

Calcite Agoudal mine, Agoudal, Bou

Calcite Agoudal mine, Agoudal, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco, Africa. 9 x 9 x 4 cm; 203 gram (Author: Louis Friend)

Calcite Agoudal mine, Agoudal, Bou

Calcite Agoudal mine, Agoudal, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco, Africa. 9 x 9 x 4 cm; 203 gram (Author: Louis Friend)

Calcite Agoudal mine, Agoudal, Bou

Calcite Agoudal mine, Agoudal, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco, Africa. 9 x 9 x 4 cm; 203 gram (Author: Louis Friend)

Calcite Agoudal mine, Agoudal, Bou

Calcite Agoudal Mines, Agoudal, Bou Azzer, Tazenakht, Ouarzazate Province, Morocco 6.9 x 7.7 cm. Pink crystals of cobaltian calcite with nailhead terminations covering the top surface of a thin matrix plate. (Author: crosstimber)

Calcite Agoudal Mines, Agoudal, Bo

Calcite Allmendingen, Baden-Württemberg, Germany. 10,5 x 5,5 cm (Author: Andreas Gerstenberg)

Calcite Allmendingen, Baden-Württe

Calcite Androvo Mine, Erma Reka, Zlatograd District, Smolyan Oblast, Bulgaria 7.5 x 9.0 cm. Pale pink scalenohedrons with low-angle rhomb terminations. Mined in summer 2004. (Author: crosstimber)

Calcite Androvo Mine, Erma Reka, Z

Calcite Annabel Lee Mine, Harris Creek Sub-District, Hardin Co., Illinois 5.1 x 6.6 cm. These calcites with distinctive sceptered terminations were recovered from the Bethel Level in 1986. There were very few since the pockets were small and they were difficult to extract in one piece. (Author: crosstimber)

Calcite Annabel Lee Mine, Harris C

Calcite Artana quarry, Carrara, Apuan Alps, Massa-Carrara Province, Tuscany, Italy 38.25 mm Calcite crystal on marble (Author: Matteo_Chinellato)

Calcite Artana quarry, Carrara, Ap

Calcite Artana quarry, Carrara, Apuan Alps, Massa-Carrara Province, Tuscany, Italy 3.19 mm Calcite crystal (Author: Matteo_Chinellato)

Calcite Artana quarry, Carrara, Ap

Calcite Beckermet Mine, Egremont, Cumbria, England, UK 2 cm long (Author: nurbo)

Calcite Beckermet Mine, Egremont,

Calcite Berry Materials Corp quarry, North Vernon Plant, NE edge of North Vernon, Jennings Co., Indiana, USA 70 mm x 40 mm x 35 mm Side view (Author: Carles Millan)

Calcite Berry Materials Corp quarr

Calcite Berry Materials Corp quarry, North Vernon Plant, NE edge of North Vernon, Jennings Co., Indiana, USA 70 mm x 40 mm x 35 mm Close up view (Author: Carles Millan)

Calcite Berry Materials Corp quarr

Calcite Berry Materials Corp quarry, North Vernon Plant, NE edge of North Vernon, Jennings Co., Indiana, USA 70 mm x 40 mm x 35 mm Full view (Author: Carles Millan)

Calcite Berry Materials Corp quarr

Calcite Berry Materials Corp quarry, North Vernon Plant, NE edge of North Vernon, Jennings Co., Indiana, USA 70 mm x 40 mm x 35 mm Close up view (Author: Carles Millan)

Calcite Berry Materials Corp quarr

Calcite Berry Materials Corp quarry, North Vernon Plant, NE edge of North Vernon, Jennings Co., Indiana, USA 70 mm x 40 mm x 35 mm (Author: Carles Millan)

Calcite Berry Materials Corp quarr

Calcite Berry Materials Corp quarry, North Vernon Plant, NE edge of North Vernon, Jennings Co., Indiana, USA 70 mm x 40 mm x 35 mm (Author: Carles Millan)

Calcite Berry Materials Corp quarr

Calcite Berry Materials Corporation Quarry, (North Vernon Plant), North Vernon, Jennings County, Indiana, USA 11.0 x 7.0 x 6.3 cm (Author: Don Lum)

Calcite Berry Materials Corporatio

Calcite Berry Materials Corporation Quarry, (North Vernon Plant), North Vernon, Jennings County, Indiana, USA 11.0 x 7.0 x 6.3 cm (Author: Don Lum)

Calcite Berry Materials Corporatio

Calcite Bigrigg Mine, Egremont, Cumbria, England, UK 16 cm across Calcite with fine hematite inclusions from the Bigrigg Mine, Egremont. Ex Field Museum, likely recovered prior to 1890. (Author: Jesse Fisher)

Calcite Bigrigg Mine, Egremont, Cu

Calcite Biod a’ Mhurain, Duirinish, Isle of Skye, Scotland Crystalgroups approx 6cm across Calcite crystals in-situ, about 6m above the ground and out of reach! (Author: Mike Wood)

Calcite Biod a’ Mhurain, Dui

Calcite Blaengwynlais Quarry, Bwlch-y-cwm, Cardiff, Wales, UK 120mm calcite crystal showing different growth phases, the latter white calcite partially coating an earlier crystal darkened by ironstaining. Collected 1979. (Author: ian jones)

Calcite Blaengwynlais Quarry, Bwlc

Calcite Bleiwäsche, Sauerland, Northrhine-Westphalia, Germany. 8 x 7,5 cm (Author: Andreas Gerstenberg)

Calcite Bleiwäsche, Sauerland, Nor

Calcite Boldut Mine, Cavnic, Maramures, Romania 5.6 x 7.3 cm. Tightly packed scalenohedral calcite crystals arranged to form two connected spheres set on a matrix of lustrous tan dolomite. (Author: crosstimber)

Calcite Boldut Mine, Cavnic, Maram

Calcite Boldut Mine, Cavnic, Maramures, Romania 4.0x 6.0 cm. Colorless calcites to 4 cm composed of multiple acute scalenohedral crystals set on a matrix of lustrous tan siderite. Collected in 2001. (Author: crosstimber)

Calcite Boldut Mine, Cavnic, Maram

Calcite Boldut Mine, Cavnic, Maramures, Romania 8.4 x 12.0 cm. Light tan spherical calcite aggregates partially covering the terminations of quartz crystals associated with minor pyrite and sphalerite. (Author: crosstimber)

Calcite Boldut Mine, Cavnic, Maram

Calcite Boldut Mine, Cavnic, Maramures, Romania 5.0 x 5.5 cm. Pale pink manganoan calcites. The angle at which the two crystals intersect make me think that these are possible twinned on the ’butterfly’ law. (Author: crosstimber)

Calcite Boldut Mine, Cavnic, Maram

Calcite Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco Specimen size 5 cm (Author: Tobi)

Calcite Bou Azzer District, Tazena

Calcite Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco Specimen size 5 cm (Author: Tobi)

Calcite Bou Azzer District, Tazena

Calcite Bou Azzer, Tazenakht, Souss-Massa-Draâ Region, Morocco Specimen width 50 mm (Photo © previous owner Carsten Slotta) (Author: Tobi)

Calcite Bou Azzer, Tazenakht, Sous

Calcite Brandberg, Namibia F.O.V approximately 05 mm Same specimen as above (Author: Pierre Joubert)

Calcite Brandberg, Namibia F.O.V a

Calcite Brandberg, Namibia F.O.V approximately 10 mm (Author: Pierre Joubert)

Calcite Brandberg, Namibia F.O.V a

Calcite Brevik, Porsgrunn, Telemark, Norway Close up view (Author: Carles Millan)

Calcite Brevik, Porsgrunn, Tel

Calcite Brevik, Porsgrunn, Telemark, Norway 55 mm x 32 mm x 18 mm (Author: Carles Millan)

Calcite Brevik, Porsgrunn, Telemar

Calcite Brevik, Porsgrunn, Telemark, Norway 55 mm x 32 mm x 18 mm Photo by Dan Weinrich (Author: Carles Millan)

Calcite Brevik, Porsgrunn, Telemar

Calcite Buena Tiera Mine, Francisco Portillo, Santa Eulalia, Chihuahua, Mexico 7.5 x 8.4 cm. Lustrous calcite rhombs to 2.5 cm on edge colored reddish brown by iron oxides. (Author: crosstimber)

Calcite Buena Tiera Mine, Francisc

Calcite Butler-Weddington mine, Karnes Uranium District, Karnes Co., Texas, USA 70mm height. Crystal 11mm on edge Champagne colored rhombs on matrix, from a concretion. You can see where the edge of the rhomb grew against the concretion. 70mm in height, with the crystal 11mm on edge. (Author: Paul Bordovsky)

Calcite Butler-Weddington mine, Ka

Calcite Campomorto Quarry, Pietra Massa Locality, Montalto di Castro, Viterbo Province, Latium, Italy Calcite balls group of 16 mm (Author: Matteo_Chinellato)

Calcite Campomorto Quarry, Pietra

Calcite Campomorto Quarry, Pietra Massa Locality, Montalto di Castro, Viterbo Province, Latium, Italy 19 mm ball of Calcite (Author: Matteo_Chinellato)

Calcite Campomorto Quarry, Pietra

Calcite Campomorto Quarry, Pietra Massa Locality, Montalto di Castro, Viterbo Province, Latium, Italy 157.72x127.7 mm specimen features numerous botroydal clusters of pale egg yolk yellow Calcite perched in two vugs of the typically matrix (Author: Matteo_Chinellato)

Calcite Campomorto Quarry, Pietra

Calcite Campomorto Quarry, Pietra Massa, Viterbo Prov., Latium, Italy 8.0 x 8.0 cm Greenish-yellow chatoyant spherical calcite groups scattered over a gray basalt-like matrix. (Author: crosstimber)

Calcite Campomorto Quarry, Pietra

Calcite Cartagena, Murcia, Spain FOV 15 x 12 mm approx (Author: nurbo)

Calcite Cartagena, Murcia, Spain

Calcite Cartagena, Murcia, Spain FOV 20 x 15 mm approx (Author: nurbo)

Calcite Cartagena, Murcia, Spain

Calcite Cartagena, Murcia, Spain FOV 10 x 12 mm approx (Author: nurbo)

Calcite Cartagena, Murcia, Spain

Calcite Cartagena, Murcia, Spain 60 x 40 mm (Author: nurbo)

Calcite Cartagena, Murcia, Spain

Calcite Cartagena, Murcia, Spain 60 x 40 mm (Author: nurbo)

Calcite Cartagena, Murcia, Spain

Calcite Chalk Hill Quarry, Dallas, Dallas Co., Texas, USA Crystals average about 0.25" (6mm) These little Calcites are from the Chalk Hill Quarry, Dallas County, Texas the crystals average about 0.25" (6mm) (Author: Jim Prentiss)

Calcite Chalk Hill Quarry, Dallas,

Calcite Charcas, San Luis Potosi, Mexico 5.2 x 7.0 cm. A cluster of lustrous, hexagonal white calcite crystals with the classic ‘poker chip’ habit. (Author: crosstimber)

Calcite Charcas, San Luis Potosi,

Calcite Croft Quarry, Croft, Leicestershire, England, UK (Author: ian jones)

Calcite Croft Quarry, Croft, Leice

Calcite Crystal Cavern, Terlingua Mercury District , Brewster Co., Texas, USA 9.5 cm X 10 cm. Calcite, rhombohedral and zoned, same location. 9.5 cm X 10 cm. This is an example of the calcite that coats the walls, ceiling, and floor of the Crystal Cavern. The Terlingua Mercury District is characterized by breccia pipes, collapse breccias that formed just a big jumble of limestone boulders. Caves are not uncommon in the mines of the district. Lots of open cavities means good collecting. (Author: Ed Huskinson)

Calcite Crystal Cavern, Terlingua

Calcite Crystal River Quarry 2, Lecanto, Citrus County, Florida, USA Specimen: Arkenstone Photo: Jeff Scovil (Author: Jordi Fabre)

Calcite Crystal River Quarry 2, Le

Calcite Crystal River Quarry 2, Lecanto, Citrus County, Florida, USA 5.8 cm. wide Specimen: Francis Benjamin collection Photo: Jeff Scovil (Author: Jordi Fabre)

Calcite Crystal River Quarry 2, Le

Calcite Dal’negorsk, Primorskiy Kray, Far-Eastern Region, Russia 65 x 35 x 25 mm (Author: Tobi)

Calcite Dal’negorsk, Primors

Calcite Dal’Negorsk, Russia Specimen height 60 mm (Author: Tobi)

Calcite Dal’Negorsk, Russia

Calcite Dalnegorsk, Russia 5.5x4.5cm The main crystal is 3cm on edge, composed of stacked rhombahedra giving the termination a very rounded apperance. It is a soft pink colour with minor white calcite crystals surrounding it. (Author: Greg Lilly)

Calcite Dalnegorsk, Russia 5.5x4.5

Calcite Daye County, Huangshi Prefecture, Hubei Province, China 91.0 x 83.0 x 43.0 mm Blocky, lustrous amber-yellow crystals of Calcite to 33 x 26 mm are perched on dark black limestone matrix. (Author: GneissWare)

Calcite Daye County, Huangshi Pref

Calcite Daye County, Huangshi Prefecture, Hubei, China 5.7x5.7cm Striking striations on the termination of this crystal. (Author: Greg Lilly)

Calcite Daye County, Huangshi Pref

Calcite Daye Iron Mine, Huangshi Pref., Hubei Province, China 6.1 x 8.7 cm. Dark amber-colored crystals on a thin plate of black hematitic matrix. (Author: crosstimber)

Calcite Daye Iron Mine, Huangshi P

Calcite Daye Mine, Huangshi Prefecture, Hubei Province, China 11.0 x 3.3 cm (Author: Don Lum)

Calcite Daye Mine, Huangshi Prefec

Calcite Delta Carbonate Quarry, York, York Co., Pennsylvania, USA 9.1 x 10.0 cm An intergrown group of honey-colored calcite crystals to 5.5 cm. The crystals have unusual modifications and have a satiny luster. (Author: crosstimber)

Calcite Delta Carbonate Quarry, Yo

Calcite Denton Mine, Bahama Pod, Harris Creek Sub-District, Hardin Co., Illinois 6.2 x 8.3 cm Mined in 1992. (Author: crosstimber)

Calcite Denton Mine, Bahama Pod, H

Calcite Eastern Products Quarry, Winfield, Union Co., Pennsylvania, USA Overall size 6.5 x 9.0 cm FOV~7.5 cm Colorless calcite crystals lining a cavity in a pale gray limestone matrix. (Author: crosstimber)

Calcite Eastern Products Quarry, W

Calcite Egremont, Cumbria, England 8.0 x 11.5 cm. Prismatic crystals to 2.1 cm with low angle terminations. (Author: crosstimber)

Calcite Egremont, Cumbria, England

Calcite Eller Beck, Askrigg, North Yorkshire, England, UK Calcite to 12 mm (Author: nurbo)

Calcite Eller Beck, Askrigg, North

Calcite Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA 195 mm x 110 mm (Author: Carles Millan)

Calcite Elmwood mine, Carthage, Ce

Calcite Elmwood mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith Co., Tennessee, USA 195 mm x 110 mm Side view (Author: Carles Millan)

Calcite Elmwood mine, Carthage, Ce

Calcite Elmwood Mine, Carthage, Smith County, Tennessee, USA 93 mm x 45 mm x 40 mm (Author: Carles Millan)

Calcite Elmwood Mine, Carthage, Sm

Calcite Elmwood Mine, Carthage, Smith County, Tennessee, USA 93 mm x 45 mm x 40 mm (Author: Carles Millan)

Calcite Elmwood Mine, Carthage, Sm

Calcite Elmwood Mine, Carthage, Smith County, Tennessee, USA 93 mm x 45 mm x 40 mm (Author: Carles Millan)

Calcite Elmwood Mine, Carthage, Sm

Calcite Elmwood mine, Carthage, Smith Co., Tennessee, USA 100 x 90 x 50 mm, main crystal 50 mm (Author: Tobi)

Calcite Elmwood mine, Carthage, Sm

Calcite Elmwood mine, Carthage, Smith Co., Tennessee, USA 100 x 90 x 50 mm, main crystal 50 mm (Author: Tobi)

Calcite Elmwood mine, Carthage, Sm

Calcite Elmwood mine, Carthage, Smith Co., Tennessee, USA 100 x 90 x 50 mm, main crystal 50 mm (Author: Tobi)

Calcite Elmwood mine, Carthage, Sm

Calcite Elmwood mine, Carthage, Smith Co., Tennessee, USA Main crystal (50 mm) (Author: Tobi)

Calcite Elmwood mine, Carthage, Sm

Calcite Elmwood mine, Carthage, Smith Co., Tennessee, USA fov 180 mm (Author: ploum)

Calcite Elmwood mine, Carthage, Sm

Calcite Elmwood mine, Carthage, Tennessee, USA Main crystal measures 5 cm (Author: Tobi)

Calcite Elmwood mine, Carthage, Te

Calcite Elmwood Mine, Middle Tennessee District, Carthage, Smith County, Tennessee, USA Specimen width 85 mm (Author: Tobi)

Calcite Elmwood Mine, Middle Tenne

Calcite Elmwood Mine, Smith County, Tennessee, USA 8.4 x 6.3 cm (Author: Don Lum)

Calcite Elmwood Mine, Smith County

Calcite Elmwood Mine, Smith County, Tennessee, USA 8.4 x 6.3 cm (Author: Don Lum)

Calcite Elmwood Mine, Smith County

Calcite Elmwood Mine, Smith County, Tennessee, USA 9.7 x 7.0 cm (Author: Don Lum)

Calcite Elmwood Mine, Smith County

Calcite Elmwood Mine, Smith County, Tennessee, USA 5.5 x 2.5 cm (Author: Don Lum)

Calcite Elmwood Mine, Smith County

Calcite Elmwood, Tennessee, USA 16.5 cm A great, gemmy calcite, perfect color. (Author: John Nash)

Calcite Elmwood, Tennessee, USA 16

Calcite Elmwood, Tennessee, USA overall size 33.5 X 22 cm A 15 cm calcite and several smaller golden calcites actually glue two pieces of limestone together. (Author: John Nash)

Calcite Elmwood, Tennessee, USA ov

Calcite Fengjiashan Mine, (Daye Copper Mine), Daye County, Huangshi Prefecture, Hubei Province, China 4.7 x 3.1 cm (Author: Don Lum)

Calcite Fengjiashan Mine, (Daye Co

Calcite First Sovietskiy Mine, Dal’negorsk, Primorskiy Kray, Russia 4.0 x 5.5 cm. An intergrown group of colorless tabular hexagonal crystals associated with a small piece of green fluorite. (Author: crosstimber)

Calcite First Sovietskiy Mine, Dal

Calcite Flambeau Mine, near Ladysmith, Rusk County, Wisconsin, USA 81 x 69 x 43 mm Another view (Author: GneissWare)

Calcite Flambeau Mine, near Ladysm

Calcite Flambeau Mine, near Ladysmith, Rusk County, Wisconsin, USA 81 x 69 x 43 mm From the East End Footwall Orebody, Marker 418.0 1010 Level "Wheat sheave" shaped white Calcites to 32 x 16 mm, with pearly luster and light-red Hematite accents are perched on sparkly contrasting matrix of Calcite. Although there is some damage, this is a very rare and important specimen-one of only three Calcites found at the Flambeau Mine in Wisconsin, and the very best one found. It was collected by Casey Jones who sold it to F. John Barlow (#5972), and was later consigned to Casey upon dissolution of the Barlow collection. (Author: GneissWare)

Calcite Flambeau Mine, near Ladysm

Calcite Flambeau Mine, near Ladysmith, Rusk County, Wisconsin, USA 81 x 69 x 43 mm "Wheat sheave" shaped white Calcites to 32 x 16 mm, with pearly luster and light-red Hematite accents are perched on sparkly contrasting matrix of Calcite. Although there is some damage, this is a very rare and important specimen-one of only three Calcites found at the Flambeau Mine in Wisconsin, and the very best one found. It was collected by Casey Jones who sold it to F. John Barlow (#5972), and was later consigned to Casey upon dissolution of the Barlow collection. (Author: GneissWare)

Calcite Flambeau Mine, near Ladysm

Calcite Fozichong Mine, Cenxi Co., Wuzhou Pref., Guangxi Zhuang AR, China 6.1 x 7.2 cm Doubly-terminated, colorless , barrel-shaped calcite crystal with opaque white zones at the terminal ends on a matrix of smaller calcite crystals. (Author: crosstimber)

Calcite Fozichong Mine, Cenxi Co.,

Calcite Fozichong Mine, Cenxi Co., Wuzhou Pref., Guangxi Zhuang AR, China 4.2 x 6.7 cm. Colorless prismatic calcite crystals with opaque white zones at the terminal ends on a matrix of smaller calcite crystals. (Author: crosstimber)

Calcite Fozichong Mine, Cenxi Co.,

Calcite Francisco I. Madero Mine, Municipality of Zacatecas, Zacatecas, Mexico 2 cm x 1.5 cm x 1.4 cm (Author: Williams Antonio)

Calcite Francisco I. Madero Mine,

Calcite Francisco I. Madero Mine, Municipality of Zacatecas, Zacatecas, Mexico 3 cm x 3.4 cm x 3 cm (Author: Williams Antonio)

Calcite Francisco I. Madero Mine,

Calcite Francisco I. Madero Mine, Municipality of Zacatecas, Zacatecas, Mexico 1.7 cm x 2.4 cm x 1 cm (Author: Williams Antonio)

Calcite Francisco I. Madero Mine,

Calcite Francisco I. Madero Mine, Municipality of Zacatecas, Zacatecas, Mexico 2.3 cm x 2.5 cm x 1.3 cm (Author: Williams Antonio)

Calcite Francisco I. Madero Mine,

Calcite Francisco I. Madero Mine, Municipality of Zacatecas, Zacatecas, Mexico 2.2 cm x 2.6 cm x 1.9 cm (Author: Williams Antonio)

Calcite Francisco I. Madero Mine,

Calcite Francisco I. Madero Mine, Municipality of Zacatecas, Zacatecas, Mexico 5.4 cm x 3.7 cm x 4 cm (Author: Williams Antonio)

Calcite Francisco I. Madero Mine,

Calcite Francisco I. Madero Mine, Municipality of Zacatecas, Zacatecas, Mexico 10cm x 4.3 cm x 5.3 cm (Author: Williams Antonio)

Calcite Francisco I. Madero Mine,

Calcite Francisco I. Madero Mine, Municipality of Zacatecas, Zacatecas, Mexico 5.5 cm x 3.3 cm x 3.7 cm (Author: Williams Antonio)

Calcite Francisco I. Madero Mine,

Calcite Francisco I. Madero Mine, Municipality of Zacatecas, Zacatecas, Mexico 6.4cm x 7.5 cm x 4.3 cm (Author: Williams Antonio)

Calcite Francisco I. Madero Mine,

Calcite Freiberg, Erzgebirge, Saxony (Author: Roger Warin)

Calcite Freiberg, Erzgebirge, Saxo

Calcite Freiberg, Erzgebirge, Saxony With 365 nm light (Author: Roger Warin)

Calcite Freiberg, Erzgebirge, Saxo

Calcite Frischglück mine, St. Roman, Wittichen, Black Forest, Baden-Württemberg, Germany 8,8 x 6 cm (Author: Andreas Gerstenberg)

Calcite Frischglück mine, St. Roma

Calcite Frizington, West Cumberland Iron Field, Cumbria, England, UK 8.1 x 6.0 cm (Author: am mizunaka)

Calcite Frizington, West Cumberlan

Calcite Fujian Province, China 3.6 x 2.8 cm Twinned crystal (Author: Don Lum)

Calcite Fujian Province, China 3.6

Calcite Fujian Province, China approx. 8 cm tall (Author: xdxucn)

Calcite Fujian Province, China app

Calcite Gallatin Canyon, Montana 7.5 cm This is the largest of several calcites on this 17.5 cm specimen (Author: John Nash)

Calcite Gallatin Canyon, Montana 7

Calcite Gallatin Canyon, Montana, USA 17 X 10 X 6 cm This is a fine, classic Gallatin Canyon calcite specimen. It is nearly a floater, I can find only two 1-cm points of attachment from what must have been a large pocket with branching, lobular matrices in it, covered with tiny calcites. On top of those grew the large golden scalenohedrons. The largest calcite is 7.5 cm (3 inches) and is doubly terminated. All the large scalenohedrons are undamaged. The overall size of this grand specimen is 17 X 10 X 6 cm. The specimen was passed from Ronald L. Anderson of Littleton, CO to the Buckskin Booksellers of Ouray, CO. I purchased in from Robert Stouffer, also of Ouray, CO. (Author: John Nash)

Calcite Gallatin Canyon, Montana,

Calcite GB4 pit, Gill Brow Iron Mine, Lindal in Furness, Cumbria, England, UK. FOV 40 x 30 mm approx (Author: nurbo)

Calcite GB4 pit, Gill Brow Iron Mi

Calcite GB4 pit, Gill Brow Iron Mine, Lindal in Furness, Cumbria, England, UK. 110 x 80 mm (Author: nurbo)

Calcite GB4 pit, Gill Brow Iron Mi

Calcite Gioia quarries, Casette, Massa, Apuan Alps, Massa-Carrara Province, Tuscany, Italy Nice group of Calcite crystals of 56.84 mm (Author: Matteo_Chinellato)

Calcite Gioia quarries, Casette, M

Calcite Golden Cross Mine, Waihi, New Zealand 12x9 cm The Golden Cross Mine was re opened in 1991 for gold and silver production, closing in 1998. Mostly calcite specimens were preserved (Author: Greg Lilly)

Calcite Golden Cross Mine, Waihi,

Calcite Golden Cross Mine, Waihi, New Zealand 7x7cm A single crystal, fairly coarse surface but a good luster. (Author: Greg Lilly)

Calcite Golden Cross Mine, Waihi,

Calcite Gopher Valley Quarry, Yamhill County, Oregon, USA 18cm x 10cm x 15cm (Author: Mark Ost)

Calcite Gopher Valley Quarry, Yamh

Calcite Gopher Valley Quarry, Yamhill County, Oregon, USA 18cm x 10cm x 15cm (Author: Mark Ost)

Calcite Gopher Valley Quarry, Yamh

Calcite Gopher Valley Quarry, Yamhill County, Oregon, USA 18cm x 10cm x 15cm (Author: Mark Ost)

Calcite Gopher Valley Quarry, Yamh

Calcite Gordonsville Mine, Carthage, Smith County, Tennessee, USA 7.5 x 11.0 cm Doubly terminated gemmy amber-colored calcites on a small shard of limestone. (Author: crosstimber)

Calcite Gordonsville Mine, Carthag

Calcite Gordonsville Mine, Carthage, Smith County, Tennessee, USA 7.3 x 12.2 cm. Doubly terminated twinned crystals of calcite in parallel growth. (Author: crosstimber)

Calcite Gordonsville Mine, Carthag

Calcite Hampstead Farm Quarry, Chipping Sodbury, Gloustershire, England, UK (Author: ian jones)

Calcite Hampstead Farm Quarry, Chi

Calcite Hartley Birkett, Cumbria, UK. FOV 25 x 20 mm (Author: nurbo)

Calcite Hartley Birkett, Cumbria,

Calcite Hartley Birkett, Cumbria, UK. 60 x 40 mm (Author: nurbo)

Calcite Hartley Birkett, Cumbria,

Calcite Hercules Mine, Coahuila, Mexico. 15 cms This is one of my favorite pieces. calcite crystals with two chocolate-called miter ovispo. (Author: javmex2)

Calcite Hercules Mine, Coahuila, M

Calcite Hercules Mine, Coahuila, Mexico 15 cms. twinned crystals composed of 4 cm. (Author: javmex2)

Calcite Hercules Mine, Coahuila, M

Calcite Hercules Mine, Coahuila, Mexico 15 cms. (Author: javmex2)

Calcite Hercules Mine, Coahuila, M

Calcite Hercules Mine, Coahuila, Mexico. 8 cm. (Author: javmex2)

Calcite Hercules Mine, Coahuila, M

Calcite Hercules Mine, Coahuila, Mexico. 8 cm. (Author: javmex2)

Calcite Hercules Mine, Coahuila, M

Calcite Hercules Mine, Coahuila, Mexico. 8 cm. (Author: javmex2)

Calcite Hercules Mine, Coahuila, M

Calcite Hercules Mine, Coahuila, Mexico. 8 cm. (Author: javmex2)

Calcite Hercules Mine, Coahuila, M

Calcite Hercules Mine, Coahuila, Mexico. 25 cm. (Author: javmex2)

Calcite Hercules Mine, Coahuila, M

Calcite Hercules Mine, Municipio de Camargo, Chihuahua, Mexico 191 x 87 x 65 mm This cluster of Calcite crystals consists of both elongated scalenahedrons and butterfly twins (to 44 mm) with a reddish tinge from Hematite inclusions that deepens in color towards the centers of the Calcite crystals forming nice Hematite phantoms. The Calcites also display distinct chatoyancy. Although it presents damage around the margins where it was removed, it is one of the only surviving specimens from what was reportedly a large, several meters long cave completely covered by such Calcite. It was given to me by Francisco Aguilera who worked at the Hercules Mine and actually collected it. Casey Jones and I met Francisco through the mine office because he spoke some English. (Author: GneissWare)

Calcite Hercules Mine, Municipio d

Calcite Herja Mine, Baia Mare, Maramures Romania 5.5 x 6.5 cm. Single creamy-white calcite on drusy quartz encrusting black sphalerite. From a unique pocket in the orebody mined in summer 2004. (Author: crosstimber)

Calcite Herja Mine, Baia Mare, Mar

Calcite Herja Mine, Baia Mare, Maramures Romania 3.0 x 4.5 cm. Intergrown group of curved rhombic calcites heavily included with jamesonite. (Author: crosstimber)

Calcite Herja Mine, Baia Mare, Mar

Calcite Herja Mine, Baia Mare, Maramures, Romania 5.1 x 8.7 cm. Six interconnected calcite spheres sharply zoned light tan on one side and smoky gray on the other from abundant inclusions of jamesonite. Mined in 2003. (Author: crosstimber)

Calcite Herja Mine, Baia Mare, Mar

Calcite Herja Mine, Baia Mare, Maramures, Romania 5.2 x 5.6 cm. Hemispherical-shaped crystallized cream-colored calcite. (Author: crosstimber)

Calcite Herja Mine, Baia Mare, Mar

Calcite Herja Mine, Baia Mare, Maramures, Romania 6.7 x 7.7 cm. Multiple, flattened, stacked calcite rhombs on a matrix composed of small dolomite crystals and single calcite rhombs. The underside is composed of small quartz crystals many of which contain sulphide inclusions. (Author: crosstimber)

Calcite Herja Mine, Baia Mare, Mar

Calcite Holbrook Mine, Bisbee, Warren District, Cochise Co., Arizona 5.8 x 8.0 cm. Colorless helectites of calcite emanating from crystallized calcite tinged by secondary copper minerals. (Author: crosstimber)

Calcite Holbrook Mine, Bisbee, War

Calcite Huanggang Complex, Keshiketeng Co., Chifeng Pref., Inner Mongolia AR, China 4.2 x 6.5 cm A group of zoned pale pink manganoan calcite crystals that exhibits bright red fluorescence under SW UV light. (Author: crosstimber)

Calcite Huanggang Complex, Keshike

Calcite Huanggang Fe-Sn deposit (Huanggangliang Mine; Huanggang Mine), Hexigten Banner (Keshiketeng Co.), Ulanhad League (Chifeng Prefecture), Inner Mongolia Autonomous Region, China 15 x 14 x 13 mm Calcite with inclusions (Author: xdxucn)

Calcite Huanggang Fe-Sn deposit (H

Calcite Huanggang Mine #5, Chifeng Pref., Inner Mongolia AR, China 9.5 x 16.0 cm A group of club-shaped manganese-rich calcite crystals. There are small hedenbergite-included quartz crystals on the backside. (Author: crosstimber)

Calcite Huanggang Mine #5, Chifeng

Calcite Huinac (Winac) Mine, La Merced, Aija Province, Ancash Dept. Peru 5.0 x 6.0 cm Gray to black hexagonal prism with a low angle rhomb termination in association with black sphalerite and drusy quartz. (Author: crosstimber)

Calcite Huinac (Winac) Mine, La Me

Calcite Hunan Province, China 22.2 x 13 cm (Author: Don Lum)

Calcite Hunan Province, China 22.2

Calcite Hunan Province, China 22.2 x 13 cm (Author: Don Lum)

Calcite Hunan Province, China 22.2

Calcite Hunan Province, China 22.2 x 13 cm (Author: Don Lum)

Calcite Hunan Province, China 22.2

Calcite Hunan Province, China 22.2 x 13 cm (Author: Don Lum)

Calcite Hunan Province, China 22.2

Calcite Hunan Province, China 8.3x6.3cm Colourless and lusterous calcite crystal cluster. Sorry, no more accurate location. (Author: Greg Lilly)

Calcite Hunan Province, China 8.3x

Calcite Hunan Province, China 8.3x6.3cm (Author: Greg Lilly)

Calcite Hunan Province, China 8.3x

Calcite Iraí, Alto Uruguai region, Rio Grande do Sul, Brazil Largest crystal measures 4,5 cm (Author: Tobi)

Calcite Iraí, Alto Uruguai region,

Calcite Iraí, Alto Uruguai region, Rio Grande do Sul, Brazil 10.0 x 11.5 cm (Author: am mizunaka)

Calcite Iraí, Alto Uruguai region,

Calcite Irai, Rio Grande do Sul, Brazil 5.3 x 8.6 cm. Frosty scalenohedral calcite crystals with micro-stepped prism faces on a thin rind of basalt. Fluorescent pink under SW UV illumination. (Author: crosstimber)

Calcite Irai, Rio Grande do Sul, B

Calcite Jalgaon, Maharashtra State, India 4.9 x 5.9 cm Interpenetrant, colorless, distorted rhombs on a small shard of chalcedony. (Author: crosstimber)

Calcite Jalgaon, Maharashtra State

Calcite Jiepaiyu Mine, Shimen, Changde Pref., Hunan Prov., China 6.5 x 7.5 cm. Sharp pale yellow, somewhat flattened scalenohedral crystals with minor realgar inclusions. (Author: crosstimber)

Calcite Jiepaiyu Mine, Shimen, Cha

Calcite Jiepaiyu Mine, Shimen, Changde Pref., Hunan Prov., China 7.5 x 8.2 cm Sharp pale yellow, scalenohedral calcite crystals on massive gray calcite matrix. Several smaller crystals on the base have inclusions of realgar. (Author: crosstimber)

Calcite Jiepaiyu Mine, Shimen, Cha

Calcite Joplin Field, Tri-State District, Jasper Co., Missouri, USA 101 mm x 66 mm x 93 mm (Author: Carles Millan)

Calcite Joplin Field, Tri-State Di

Calcite Joplin Field, Tri-State District, Jasper Co., Missouri, USA Overall size: 101 mm x 66 mm x 93 mm. Until year 2007 it belonged to the James & Dawn Minette collection, Boron, California, with label #WW109. Photo copyright © Carles Millan. Reproduction allowed as long as the author’s name is cited. Creative Commons Attribution License - Some Rights Reserved. (Author: Jordi Fabre)

Calcite Joplin Field, Tri-State Di

Calcite Joplin, Missouri, USA 12 x 7.5 cm (Author: Don Lum)

Calcite Joplin, Missouri, USA 12 x

Calcite Juchem Quarry, Herrstein, Hunsrück, Rhineland-Palatinate, Germany Specimen size 13 x 9 cm (Author: Tobi)

Calcite Juchem Quarry, Herrstein,

Calcite Juchem Quarry, Herrstein, Hunsrück, Rhineland-Palatinate, Germany Specimen size 13 x 9 cm (Author: Tobi)

Calcite Juchem Quarry, Herrstein,

Calcite Juchem Quarry, Herrstein, Hunsrück, Rhineland-Palatinate, Germany Specimen height 13 cm, largest crystals ~ 3 cm (Author: Tobi)

Calcite Juchem Quarry, Herrstein,

Calcite Juchem Quarry, Niederwörresbach, Herrstein, Hunsrück, Rhineland-Palatinate, Germany 13 x 9 cm Collection & Photo: Tobias Martin (Author: Tobi)

Calcite Juchem Quarry, Niederwörre

Calcite Kannad, Aurangabad District, Maharashtra, India 5.2 x 6.8 cm A hemisphere of white scolecite with a narrow band of amber-colored calcite running from one side to the other and a few pale tan stilbite crystals (Author: crosstimber)

Calcite Kannad, Aurangabad Distric

Calcite Karaman, Turkey 2.5 x 2.5 x 3 cm. Little calcite (Author: barbie90)

Calcite Karaman, Turkey 2.5 x 2.5

Calcite Karkhane sang asfalt, Komshejeh (Komshecheh), Ardestan County, Esfahan Province (Isfahan Province; Aspadana Province), Iran 12 * 16 cm (Author: h.abbasi)

Calcite Karkhane sang asfalt, Koms

Calcite Karkhane sang asfalt, Komshejeh (Komshecheh), Ardestan County, Esfahan Province (Isfahan Province; Aspadana Province), Iran 6 cm (Author: h.abbasi)

Calcite Karkhane sang asfalt, Koms

Calcite Kenoyer Mine, Picher, Ottawa County, Oklahoma, USA 7.0 x 8.9 cm. (Author: crosstimber)

Calcite Kenoyer Mine, Picher, Otta

Calcite Kruchev dol Mine, Madan Orefield, Smolyan Oblast, Bulgaria 12.2 x 13.1 cm. Colorful specimen of light brown and reddish-brown siderite with creamy white calcite rhombs scattered over a matrix of galena and quartz. Mined in 2008. (Author: crosstimber)

Calcite Kruchev dol Mine, Madan Or

Calcite La Cuerre Mine, La Florida mining area, Cantabria, Spain Specimen width 50 mm, large crystals 15, 9 and 7 mm (Author: Tobi)

Calcite La Cuerre Mine, La Florida

Calcite La Cuerre Mine, Rionansa (Herrerías), La Florida mining area, Sierra de Arnero, Cantabria, Spain Largest crystal 15 mm (Author: Tobi)

Calcite La Cuerre Mine, Rionansa (

Calcite La Cuerre Mine, Rionansa (Herrerías), La Florida mining area, Sierra de Arnero, Cantabria, Spain Largest crystal 15 mm (Author: Tobi)

Calcite La Cuerre Mine, Rionansa (

Calcite La Cuerre Mine, Rionansa (Herrerías), La Florida mining area, Sierra de Arnero, Cantabria, Spain Crystal size 15 mm (Author: Tobi)

Calcite La Cuerre Mine, Rionansa (

Calcite La Cuerre Mine, Rionansa (Herrerías), La Florida mining area, Sierra de Arnero, Cantabria, Spain 12x9 cm. Fot. & Col. Juan Hernandez. Adquired in July of 2010. Found in 2001. Detail of the previous specimen (Author: supertxango)

Calcite La Cuerre Mine, Rionansa (

Calcite La Cuerre Mine, Rionansa (Herrerías), La Florida mining area, Sierra de Arnero, Cantabria, Spain 12x9 cm. Fot. & Col. Juan Hernandez. Adquired in July of 2010. Found in 2001. (Author: supertxango)

Calcite La Cuerre Mine, Rionansa (

Calcite La Cuerre Mine, Rionansa (Herrerías), La Florida mining area, Sierra de Arnero, Cantabria, Spain Largest crystal 1,5 cm (Author: Tobi)

Calcite La Cuerre Mine, Rionansa (

Calcite La Farge quarry, Medford, Maryland, USA 7 cm (Author: John Medici)

Calcite La Farge quarry, Medford,

Calcite La Florida mining area, Sierra de Arnero, Cantabria, Spain Specimen size 5 cm (Author: Tobi)

Calcite La Florida mining area, Si

Calcite La Sambre Quarry, Landelies, Hainault, Belgium. Crystal approx 20 mm across. (Author: nurbo)

Calcite La Sambre Quarry, Landelie

Calcite La Sambre Quarry, Landelies, Hainault, Belgium. 55 x 50 mm (Author: nurbo)

Calcite La Sambre Quarry, Landelie

Calcite La Sambre Quarry, Landelies, Hainaut, Belgium 5.6 x 9.4 cm. Transparent twinned crystals to 2.3 cm. This was part of a very big specimen which I obtained in a trade and reluctantly decided to trim. I was pleased with the result - definitely one of my more successful ventures in trimming. (Author: crosstimber)

Calcite La Sambre Quarry, Landelie

Calcite La Sambre Quarry, Landelies, Hainaut Province, Belgium Specimen size 7 cm (Author: Tobi)

Calcite La Sambre Quarry, Landelie

Calcite La Sambre Quarry, Landelies, Hainaut Province, Belgium Specimen height 7 cm (Author: Tobi)

Calcite La Sambre Quarry, Landelie

Calcite Lane Quarry, Hampden County, Westfield, Massasuchetts, USA Crystal is 2 cm. (Author: vic rzonca)

Calcite Lane Quarry, Hampden Count

Calcite Langer Köchel quarry, Murnauer Moos, Garmisch-Partenkirchen, Upper Bavaria, Bavaria, Germany 10 x 8 cm (Author: Andreas Gerstenberg)

Calcite Langer Köchel quarry, Murn

Calcite Leiping Mine, Guiyang Co., Chenzhou Pref,, Hunan Prov., China 5.0 x 5.2 cm A group of colorless calcite crystals with clearly visible hematite-coated,reddish brown scalenohedral phantoms. (Author: crosstimber)

Calcite Leiping Mine, Guiyang Co.,

Calcite Leiping Mine, Guiyang Co., Chenzhou Pref,, Hunan Prov., China 11.0 x 15.0 cm. Milky white Calcite crystals terminated by a steep pyramid and tinged reddish brown with iron oxides. (Author: crosstimber)

Calcite Leiping Mine, Guiyang Co.,

Calcite Leiping, Guiyang Co., Chenzhou Prefecture, Hunan Province, China 16.0 x 11.0 cm (Author: am mizunaka)

Calcite Leiping, Guiyang Co., Chen

Calcite Leopold Stehender vein, Beschert Glück mine, Freiberg, Erzgebirge, Saxony. 7 x 3 cm. (Author: Andreas Gerstenberg)

Calcite Leopold Stehender vein, Be

Calcite Linwood Mine, Buffalo, Scott Co., Iowa, USA Twin is 5 x 4.5 cm (Author: Matt_Zukowski)

Calcite Linwood Mine, Buffalo, Sco

Calcite Linwood Mine, Buffalo, Scott Co., Iowa, USA 32 x 15 x 14 cm (Author: Matt_Zukowski)

Calcite Linwood Mine, Buffalo, Sco

Calcite Longview Quarry, Shelby, Alabama, USA Specimen size: 5.1 x 4.3 cm. Photo: Bob Weaver Bob Weaver supplied the photo below to lead the state of Alabama. Thank you Bob! (Author: Jordi Fabre)

Calcite Longview Quarry, Shelby, A

Calcite Mahlscheid quarry, Herdorf, Siegerland, Rhineland-Palatinate, Germany. 8 x 5 cm After analysis all "aragonites" turned out to be calcite! (Author: Andreas Gerstenberg)

Calcite Mahlscheid quarry, Herdorf

Calcite Mahlscheid quarry, Herdorf, Siegerland, Rhineland-Palatinate, Germany 8 x 5 cm (Author: Andreas Gerstenberg)

Calcite Mahlscheid quarry, Herdorf

Calcite Malmberget, Gällivare, Lappland, Sweden A lovely plate of calcite from Sweden. Ex Peter Lyckberg. (Author: Gail)

Calcite Malmberget, Gällivare, Lap

Calcite Manaoshan Mine, Linwu Co, Chenzhou Pref, Hunan Prov., China 9.0 x 15.0 cm. Sharp, pale pink flattened rhombs stacked one atop another. Exhibits strong orange fluorescence under SW and LW UV. (Author: crosstimber)

Calcite Manaoshan Mine, Linwu Co,

Calcite Manaoshan Mine, Linwu Co., Chenzhou Pref., Hunan Prov.. China 6.3 x 8.5 cm Flattened pale pinkish calcite rhombs with preferential druse of pyrite on the crystal edges. (Author: crosstimber)

Calcite Manaoshan Mine, Linwu Co.,

Calcite Mariposa Mine, Terlingua District, Brewster Co., Texas, USA 18" x 14" (Author: yotes1az)

Calcite Mariposa Mine, Terlingua D

Calcite Mas Dieu, Mercoirol, Gard, Languedoc-Roussillon, France fov 3.5 mm (Author: ploum)

Calcite Mas Dieu, Mercoirol, Gard,

Calcite Meikle Mine, Bootstrap District, near Carlin, Elko County, Nevada 15.8 x 11.2 x 10.0 cm 401K Crystal Chamber, South Meikle Main Ramp (Author: GneissWare)

Calcite Meikle Mine, Bootstrap Dis

Calcite Minerva #1 Mine, Hardin County, Illinois, USA 15.2 x 13.7 cm (Author: Don Lum)

Calcite Minerva #1 Mine, Hardin Co

Calcite Minerva No. 1 Mine, Cave In Rock Sub-District, Hardin Co., Illinois 7.5 x 7.5 cm. (Author: crosstimber)

Calcite Minerva No. 1 Mine, Cave I

Calcite Minerva No. 1 Mine, Cave-in-Rock, Hardin Co., Illinois, USA 7.2 x 4.9 cm (Author: am mizunaka)

Calcite Minerva No. 1 Mine, Cave-i

Calcite Mirzapur, Gangapur District, Maharashtra, India 8.1 x 10.9 cm. Sharp calcite scalenohedrons to 2.5 cm with bladed, white stilbite crystals on drusy pink heulandite. Collected in 2006. (Author: crosstimber)

Calcite Mirzapur, Gangapur Distric

Calcite models (Author: Roger Warin)

Calcite models

Calcite Mogila deposit, Septemvri Mine, Madan District, Smolyan Oblast, Bulgaria 9.0 x 10.0 cm. Unusual zoned hexagonal calcite crystals with chalcopyrite and secondary crystal development on the pinacoid faces. Mined in 1980. (Author: crosstimber)

Calcite Mogila deposit, Septemvri

Calcite Mogila deposit, Septemvri Mine, Madan District, Bulgaria 4.7 x5.3 c,. These calcites have an unusual habit with tightly bunched scalenohedrons, brownish green centers and light gray terminations. (Author: crosstimber)

Calcite Mogila deposit, Septemvri

Calcite Moncure Quarry, Lee County, North Carolina, USA 7.5 x 3 x 2 cm (Author: Scott LaBorde)

Calcite Moncure Quarry, Lee County

Calcite Moncure Quarry, Lee County, North Carolina, USA 2.5 x 1 cm (Author: Scott LaBorde)

Calcite Moncure Quarry, Lee County

Calcite Monroe, Michigan, USA 6.7 x 4.8 x 3.1 cm (Author: Don Lum)

Calcite Monroe, Michigan, USA 6.7

Calcite Morococha District, Yauli Prov., Junin Dept., Peru 4.5 x 6.5 cm. Sugary-textured, tan scalenohedral calcite crystals, several of which have a secondary growth forming a cap on the original termination. (Author: crosstimber)

Calcite Morococha District, Yauli

Calcite N’Chwaning II Mine, Kuruman, N. Cape Prov., South Africa 6.5 x 9.0 cm Cone-shaped groups of pinkish-tan calcite. Exhibits intense red fluorescence under SW UV light. (Author: crosstimber)

Calcite N’Chwaning II Mine,

Calcite N’Chwaning II Mine, Kuruman, N. Cape Prov., South Africa 3.5 x 7.2 cm Scalenohedral calcite crystals with a reddish-brown hue imparted by hematite. (Author: crosstimber)

Calcite N’Chwaning II Mine,

Calcite N’Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape, South Africa 50 x 27 x 21 mm (Author: Pierre Joubert)

Calcite N’Chwaning Mines, Ku

Calcite N’Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape, South Africa 35 x 23 mm The same as above (Author: Pierre Joubert)

Calcite N’Chwaning Mines, Ku

Calcite N’Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape, South Africa 35 x 23 mm A most bizarre little specimen! Clear calcite has overgrown, what appears to be, upside down calcite crystals, overcoated by some unknown mineral. (Author: Pierre Joubert)

Calcite N’Chwaning Mines, Ku

Calcite Nandan, Guangxi Zhuang, China 7.2 x 4 x 6.2 cm (Author: Don Lum)

Calcite Nandan, Guangxi Zhuang, Ch

Calcite Nandan, Guangxi Zhuang, China 7.2 x 4 x 6.2 cm (Author: Don Lum)

Calcite Nandan, Guangxi Zhuang, Ch

Calcite Nandan, Guangxi Zhuang, China 5 x 4.5 x 3.3 cm Poker Chip Habit (Author: Don Lum)

Calcite Nandan, Guangxi Zhuang, Ch

Calcite New Glencrieff mine, Wanlockhead, Dumfries and Galloway, Scotland, UK ~40cm across From the Hunterian museum in Glasgow (Author: James)

Calcite New Glencrieff mine, Wanlo

Calcite Nikolaevskiy Mine, Da’negorsk, Primorskiy Kray, Russia 5.2 x 7.0 cm. Bundles of tightly-packed scalenohedral manganoan calcite to 3.5 cm. that remind me of the calcites from Pachapaqui. Collected in August 2011. (Author: crosstimber)

Calcite Nikolaevskiy Mine, Da&rsqu

Calcite Nikolaevskiy Mine, Dal’negorsk, Primorskiy Kray, Russia 5.1 x 7.0 cm. Intergrown groups of curved lenticular calcite crystals. These were from a unique pocket found in early 2005. (Author: crosstimber)

Calcite Nikolaevskiy Mine, Dal&rsq

Calcite Nikolaevskiy Mine, Dal’negorsk, Primorskiy Kray, Russia 9.6 x 11.1 cm. This calcite is the newest addition to my Dal’negorsk suite - obtained at the 2013 Tucson Show. (Author: crosstimber)

Calcite Nikolaevskiy Mine, Dal&rsq

Calcite North Vernon, Indiana, USA 5.5x4.5cm Nicely balanced and great luster. (Author: Greg Lilly)

Calcite North Vernon, Indiana, USA

Calcite Ocna de Fier, Banat Mts., Caras-Severin Co., Romania 4.6 x 7.0 cm. A group of creamy white scalenohedrons with a reddish tinge due to hematite. (Author: crosstimber)

Calcite Ocna de Fier, Banat Mts.,

Calcite Onion River, Cook County, Minnesota, US 6 X 4 cm Another close up. (Author: John Nash)

Calcite Onion River, Cook County,

Calcite Onion River, Cook County, Minnesota, US 6 X 4 cm A close up. (Author: John Nash)

Calcite Onion River, Cook County,

Calcite Onion River, Cook County, Minnesota, US 6 X ~4cm A scalenohedron with an unusual termination. (Author: John Nash)

Calcite Onion River, Cook County,

Calcite Pachapaqui Dist, Bolognesi Prov, Ancash Dept, Peru 6x5.5cm Another view. (Author: Greg Lilly)

Calcite Pachapaqui Dist, Bolognesi

Calcite Pachapaqui Dist, Bolognesi Prov, Ancash Dept, Peru 6x5.5cm Highly flattened rhombahedral crystals to 3x0.4cm of a soft pink colour. Minor quartz in association. (Author: Greg Lilly)

Calcite Pachapaqui Dist, Bolognesi

Calcite Pachapaqui, Bolognesi Prov., Ancash Dept. Peru 6.1 x 7.6 cm. Pale pink scalenohedral calcite crystals associated with small crystals of pyrite and quartz. Like many manganoan calcites, this piece exhibits bright red fluorescence under SW UV. (Author: crosstimber)

Calcite Pachapaqui, Bolognesi Prov

Calcite Pallaflat Mine, Bigrigg, Cumbria, England 9.7 x 12.1 cm. Transparent calcite prisms to 2.5 cm covering a hematitic matrix. (Author: crosstimber)

Calcite Pallaflat Mine, Bigrigg, C

Calcite Pallaflat Mine, Bigrigg, Cumbria, England, UK 55mm calcite crystal and associated old label. Ex Robert Ferguson (1767-1840) collection (Author: ian jones)

Calcite Pallaflat Mine, Bigrigg, C

Calcite Pallaflat Mine, Bigrigg, Cumbria, England, UK 90x70mm calcite twin. Ian Jones collection, ex Richard Barstow collection Ex Richard (Dick) Barstow (1947–1982) collection. Probably traded by Dick from the Kelvingrove Museum, Glasgow (Author: ian jones)

Calcite Pallaflat Mine, Bigrigg, C

Calcite Pallaflat Mine, Bigrigg, Cumbria, England, UK Clear calcite crystals to 55mm. Ex Richard (Dick) Barstow (1947–1982) collection. Probably traded by Dick from the Kelvingrove Museum, Glasgow (Author: ian jones)

Calcite Pallaflat Mine, Bigrigg, C

Calcite Pallaflat Mine, Bigrigg, Cumbria, England, Uk Group of calcite crystals, typically 35mm (Author: ian jones)

Calcite Pallaflat Mine, Bigrigg, C

Calcite Pallaflat Mine, Bigrigg, Cumbria, England, UK Group af calcite crystals, typically 20-25mm (Author: ian jones)

Calcite Pallaflat Mine, Bigrigg, C

Calcite Pallaflat Mine, Bigrigg, West Cumberland Iron Field, North and Western Region (Cumberland), Cumbria, England, UK 11.9 x 7.5 x 6.6 cm (Author: Matt_Zukowski)

Calcite Pallaflat Mine, Bigrigg, W

Calcite Pallaflat, Cumbria, England, UK ~12cm across In the Sedgwick museum Cambridge (Author: James)

Calcite Pallaflat, Cumbria, Englan

Calcite Palo Duro Canyon area, Armstrong Co., Texas, USA 5 cm. X 7 cm. Concretion, 5 cm X 7 cm. Calcite in fine sandstone / redbed matrix. Palo Duro Canyon, near Canyon, Texas. These used to be quite common in the canyon, but many of them have been picked up by visitors, picnickers, and the like (which, i suppose, includes me too). (Author: Ed Huskinson)

Calcite Palo Duro Canyon area, Arm

Calcite Panvel, Raigad District, Maharashtra, India 7.1 x 11.0 cm. Colorless groups of scalenohedral calcite to 3.5 cm on pale peach stilbite and quartz. (Author: crosstimber)

Calcite Panvel, Raigad District, M

Calcite Pedogna Quarry, Villa a Roggio, Pescaglia, Lucca Province, Tuscany, Italy 11.15 mm group Calcite crystals (Author: Matteo_Chinellato)

Calcite Pedogna Quarry, Villa a Ro

Calcite Pend Orelle Mine, Metalina Falls, Washington, USA 3.0 x 2.0 cm (Author: Don Lum)

Calcite Pend Orelle Mine, Metalina

Calcite Pend Orelle Mine, Metalina Falls, Washington, USA 3.0 x 2.0 cm (Author: Don Lum)

Calcite Pend Orelle Mine, Metalina

Calcite Perry Pit, west side, California hill, Mariposa Mine, California Hill, Terlingua Mercury District, Brewster County, Texas, USA 3.5 cm long. Calcite, scalenohedral and zoned. Perry Pit, west side, California hill, Mariposa Mine, Terlingua Mercury district, Brewster County, Texas. 3.5 cm long. Crystals like this one are common in the district, often display planes along which dustings of cinnabar have grown. This one shows a thin coating of clay along an earlier crystal face. (Author: Ed Huskinson)

Calcite Perry Pit, west side, Cali

Calcite Picher, Ottawa County, Oklahoma, USA 9.6 cm. (Author: crosstimber)

Calcite Picher, Ottawa County, Okl

Calcite Pine Point Mine, Northwest Territories, Canada 7.0 x 10.0 cm. Honey-colored calcite rhombs to 4.5 cm on edge with frosted crystals faces. (Author: crosstimber)

Calcite Pine Point Mine, Northwest

Calcite Point Anole, Hainaut, Belgium 3.6 x 3.6 cm (Author: Don Lum)

Calcite Point Anole, Hainaut, Belg

Calcite Postojna, Notranjska Province, Slovenia 20 x 4.7 cm "Stag-horn" Stalactite ex Alvin Schortmann ex Carl R. Bentley (Author: Don Lum)

Calcite Postojna, Notranjska Provi