FMF Minerals Gallery

Analcime Knife River, St. Louis County, Minnesota, USA The specimen is about 7.5 X 8 X 6 cm. Field of view is about 3.5 cm (Author: John Nash)

Analcime
Knife River, St.

Analcime Knife River, St. Louis County, Minnesota, USA The specimen is about 7.5 X 8 X 6 cm. The analcite crystals are quite small, only about 2mm. See the close-up. (Author: John Nash)

Analcime
Knife River, St.

Apophyllite Castle Danger, Minnesota, USA The apophyllites are about 2 cm These are part of a large (40 cm) rock (coarsely crystallized gabbro) found last weekend on the coast of Lake Superior that split perfectly down the middle revealing a number of pockets. Now for some extensive work with the rock trimmer to turn these into specimens. (Author: John Nash)

Apophyllite Castle Danger, Minneso

Apophyllite on calcite Onion River, near Lutsen, Cook County, Minnesota, USA 6.5 X 4 X 4 cm A fine calcite crystal with a number of clear apophyllites on it. (Author: John Nash)

Apophyllite on ca
Onion River, near

Apophyllite on calcite Onion River, near Lutsen, Cook County, Minnesota, USA 3.5 X 3 X 3 cm A stubby little calcite crystal with many clear apophyllites growing on the top. (Author: John Nash)

Apophyllite on ca
Onion River, near

Apophyllite Onion River, near Lutsen, Cook County, Minnesota, USA Field of view 3 cm A close up of the apophyllite showing the clarity. (Author: John Nash)

Apophyllite
Onion River, near

Barite Linwood Mine, Buffalo, Iowa, USA 12.5 cm X 7 cm, 4.5 cm thick. (Author: John Nash)

Barite Linwood Mine, Buffalo, Iowa

Barite on limestone Linwood Mine, Buffalo, Iowa, USA The specimen is about 11 X 6.5 X 2.5 cm The largest crystal is 8 cm long, 2 cm thick and doubly terminated, as are most of the smaller crystals. There are crystals on both sides of the limestone. (Author: John Nash)

Barite on limestone Linwood Mine,

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 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 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 and laumontite Onion River, near Lutsen, Cook County, Minnesota, USA 3 X 1.5 cm From the same pocket as the apophyllite. (Author: John Nash)

Calcite and laumo
Onion River, near

Calcite in laumontite Near Beaver Bay, Lake County, Minnesota, USA Largest crystal is 6 cm (Author: John Nash)

Calcite in laumon
Near Beaver Bay,

Calcite in laumontite Near Beaver Bay, Lake County, Minnesota, USA 25 X 18 X 16 cm Ex-Roland Quinn, proprietor of the Beaver Bay Agate Shop at the time. Roland inherited the shop and collection from his father. This incredible specimen has a group of flat-topped pseudohexagonal calcites in a large boulder of calcite and laumontite. It clearly was a piece of a large calcite vein that broke off. The miracle is that the whole specimen looks like a water-worn rock, but the calcite crystals are pristine and undamaged, showing no signs of wear at all. Greg theorizes this must have been in a part of Lake Superior with a sandy bottom. The usual pebble bottoms would have made short work of the calcite. The largest crystal is about 6 cm across. A true Minnesota classic, rare beyond rare. (Author: John Nash)

Calcite in laumon
Near Beaver Bay,

Calcite on calcite Shullsburg-Hazel Green area, Upper Mississippi Valley District, Lafayette Co., Wisconsin, USA 8 cm tall as pictured (Author: John Nash)

Calcite on calcite Shullsburg-Haze

Calcite with apophyllite Onion River, near Lutsen, Cook County, Minnesota, USA 9 X 7 X 6 cm Two calcites, entwined like lovers, with a few apophyllites. (Author: John Nash)

Calcite with apop
Onion River, near

Calcite with pyrite inclusions Linwood Mine, Buffalo, Iowa, USA 12.5 X 8 X 6 cm. Incredible clear calcite crystals with tiny, sparkling pyrite crystals inside. Truly remarkable. (Author: John Nash)

Calcite with pyrite inclusions Lin

Calcite, Apophyllite Onion River roadcut, Lutsen Township, Cook County, Minnesota 9 X 7 X 6 cm (approximately) Another view of these lovely entwined crystals. (Author: John Nash)

Calcite, Apophyll
Onion River roadc

Calcite, apophyllite Onion River roadcut, Lutsen Township, Cook County, Minnesota 9 X 7 X 6 cm (approximately) Two large calcites sort of wrapped around each other, both with a few apophyllites gracing them. A surprising gift from the lavas of Minnesota’s North Shore (Author: John Nash)

Calcite, apophyll
Onion River roadc

Calcite, apophyllite Onion River roadcut, Lutsen Township, Cook County, Minnesota 3.5 X 3 X 3 cm Close-up of apophyllite on calcite, apos are about 4 - 5 mm (Author: John Nash)

Calcite, apophyll
Onion River roadc

Calcite, Apophyllite Onion River roadcut, Lutsen Township, Cook County, Minnesota, 3.5 X 3 X 3 cm Apophyllite on calcite showing clear to white apophyllite faces. (Author: John Nash)

Calcite, Apophyll
Onion River roadc

Calcite Near Crystal Creek, Minnesota, USA 15 X 10 X 8 cm A group of scalenohedral calcites, the largest is 4 cm, sitting in a vug of greenish quartz. Found by my son Greg in a rock slide at a road cut through the North Shore basalt. (Author: John Nash)

Calcite
Near Crystal Cree

Copper, minor chrysocolla Knife River, St. Louis County, Minnesota, USA Specimen 12 X 9 X 6 cm Field of view is about 4 cm, the main rough crystal is 2.5 cm and protrudes up out of the matrix. (Author: John Nash)

Copper, minor chr
Knife River, St.

Kinoite in calcite Knife River, St. Louis County, Minnesota, USA Specimen 7 X 6 X 5 cm, Field of view 2 cm A one time find of kinoite in calcite. (Author: John Nash)

Kinoite in calcit
Knife River, St.

Natrolite Knife River, St. Louis County, Minnesota, USA 9 X 6 X 3.5 cm A 4.5 cm pocket filled with natrolite or a closely related species. (Author: John Nash)

Natrolite
Knife River, St.

Pectolite and apophyllite Castle Danger, Minnesota, USA The pectolite spray is 2 cm across (Author: John Nash)

Pectolite and apophyllite Castle D

Pectolite Castle Danger, the Rock Yard, Minnesota, USA About 5 X 9 X 9 cm Radiating clusters of Pectolite crystals and another mineral, possibly xonotlite, in a dark green mix of augite and plagioclase altered to prehnite. About 5 X 9 X 9 cm, the specimen is an amygdule containing the pectolite, surrounded by prehnite. This was described in a 1924 article by G. M. Schwartz of the U of MN in the American Mineralogist, pp. 83 - 88. (Author: John Nash)

Pectolite
Castle Danger, th

Prehnite epimorphs of laumontite Knife River, St. Louis County, Minnesota, USA 6 X 5 X 4 cm Beautiful orange prehnite epimorphs of laumontite. (Author: John Nash)

Prehnite epimorph
Knife River, St.

Prehnite epipmorphs of laumontite Knife River, St. Louis County, Minnesota, USA 5 cm field of view (Author: John Nash)

Prehnite epipmorp
Knife River, St.

Prehnite, minor copper Knife River, St. Louis County, Minnesota, USA 8 X 6 X 5 cm Gemmy light green prehnite, some copper inside. (Author: John Nash)

Prehnite, minor c
Knife River, St.

Prehnite Knife River, St. Louis County, Minnesota, USA Field of view about 6 cm The light blue iridescence on this orange prehnite is stunning. (Author: John Nash)

Prehnite
Knife River, St.

Prehnite Knife River, St. Louis County, Minnesota, USA 9 X 7 X 4 Orange iridescent prehnite. So lovely in person, look at the close-up! Another one-time find, one boulder from the river, discovered by my son Greg. (Author: John Nash)

Prehnite
Knife River, St.

Prehnite Knife River, St. Louis County, Minnesota, USA Field of view 2.5 cm Most remarkable iridescent orange prehnite, metallic blue and purple flashes are amazing in person. I’ve found only a few examples in 5 years of visiting the locale. (Author: John Nash)

Prehnite
Knife River, St.

Prehnite Knife River, St. Louis County, Minnesota, USA Field of view 4.5 cm (Author: John Nash)

Prehnite
Knife River, St.

Prehnite Knife River, St. Louis County, Minnesota, USA Field of view 11 cm (Author: John Nash)

Prehnite
Knife River, St.

Prehnite Knife River, St. Louis County, Minnesota, USA 19.5 X 10 X 10 cm approximately This orange prehnite shows partial casts after laumontite, the largest cast is about 2 cm. The prehnite glitters with gold and some blue iridescence. (Author: John Nash)

Prehnite
Knife River, St.