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Analcime. Little Salmon River, Idaho Co. 5,5 x 4 cm. (Author: Antonio Alcaide)
Analcime. Little Salmon River, Ida
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Andradite garnet. Garnet Hill Mine (Rheona Claim), Garnet Hill, Calaveras Co., California. 7 x 5 cm. Main crystal measures 2 cm. (Author: Antonio Alcaide)
Andradite garnet. Garnet Hill Mine
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Another thenardite. Soda Lake, San Luis Obispo Co., California. 5,5 x 4 cm. (Author: Antonio Alcaide)
Another thenardite. Soda Lake, San
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Barite. Rosebud Mine, Rosebud District, Pershing Co., Nevada. 10,5 x 5,5 x 4 cm. Some faces with "frost" coating. (Author: Antonio Alcaide)
Barite. Rosebud Mine, Rosebud Dist
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Baryte
Norman, Cleveland Co., Oklahoma, USA
11 x 8 cm (Author: Antonio Alcaide)
Baryte
Norman, Cleveland Co., Okla
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Baryte
Norman, Cleveland Co., Oklahoma, USA
7 x 4 cm. (Author: Antonio Alcaide)
Baryte
Norman, Cleveland Co., Ok
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Baryte. Another pic of the same piece. Cool rose. (Author: Antonio Alcaide)
Baryte. Another pic of the same pi
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Celestine. Stoneco Quarry, Lime City, Wood Co. 6 x 4 cm. (Author: Antonio Alcaide)
Celestine. Stoneco Quarry, Lime Ci
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Chalcedony var. agate filling a fossilized coral. Withlacooche River, Florida. 8,5 x 5 cm. A bit polished. Strong fluorescence under both short and long UV waves. (Author: Antonio Alcaide)
Chalcedony var. agate filling a fo
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Close up of the previous piece (Author: Antonio Alcaide)
Close up of the previous piece
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Close-up of the colemanite (Author: Antonio Alcaide)
Close-up of the colemanite
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Close-up of the previous specimen (Author: Antonio Alcaide)
Close-up of the previous specimen
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Close-up of the previous specimen (Author: Antonio Alcaide)
Close-up of the previous specimen
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Colemanite. Boron, Kern Co., California. 8,5 x 6 cm. (Author: Antonio Alcaide)
Colemanite. Boron, Kern Co., Calif
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Colemanite. Boron, Kern Co., California. 11 x 7,5 cm. Crystals up to 1,5 cm. Ex Dr. Krantz collection. (Author: Antonio Alcaide)
Colemanite. Boron, Kern Co., Calif
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Dolomite pseudomorph after aragonite
Cottonwood Draw, Chaves Co., New Mexico, USA
7,5 x 6 x 5 cm
Grainy dolomite after a cyclic twin of aragonite, well, several twins. (Author: Antonio Alcaide)
Dolomite pseudomorph after aragoni
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Fluorite and calcite from Melchor Musquiz, Cohahuila, Mexico
10 x 8 cm
Main crystal measuring 5 cm.
Colour saturation and transparency (Author: Antonio Alcaide)
Fluorite and calc
10 x 8 cm
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Fluorite from Melchor Musquiz, Cohahuila, Mexico.
8 x 6 cm
Opaque as I like too (Author: Antonio Alcaide)
Fluorite from Mel
8 x 6 cm
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Fluorite on matrix from Blanchard Mine, Bingham, New Mexico, USA.
8 x 8 cm. Main cube: 2 cm edge (Author: Antonio Alcaide)
Fluorite on matri
8 x 8 cm. Main cu
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Franklinite on calcite matrix. Sterling Hill Mine, Ogdensburg, New Jersey. 7 x 4 x 4 cm. Main crystal 1,5 cm on edge. (Author: Antonio Alcaide)
Franklinite on calcite matrix. Ste
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Franklinite. Another pic of the same piece. The calcite is strongly fluroescent under UV lamp (long wave in this case) (Author: Antonio Alcaide)
Franklinite. Another pic of the sa
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Galena and sphalerite
Tri State District, Ottawa Co., Oklahoma, USA
8 x 4 cm.
Main cube measures 3 cm on edge. This one shows an interesting and complex shape I cannot explain properly. Geometric patterns on faces. Tiny pyrite crystals as well. (Author: Antonio Alcaide)
Galena and sphalerite
Tri State Di
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Galena and sphalerite. Another pic of the same piece. (Author: Antonio Alcaide)
Galena and sphalerite. Another pic
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Galena. Close up displaying the patterns, lovely patterns, on the faces of the cubes. (Author: Antonio Alcaide)
Galena. Close up displaying the pa
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Grossular.
Maine, USA
6 x 5 cm.
Close-up of the previous specimen. Detail of the smaller crystal.
It could be from Casco or Limerick. See: http://www.mineral-forum.com/message-board/viewtopic.php?p=37646#37646 (Author: Antonio Alcaide)
Grossular.
Maine, USA
6 x 5 cm.
C
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Grossular.
Maine, USA
6 x 5 cm.
Main crystal measures 3 cm. With Calcite and maybe Actinolite.
It could be from Casco or Limerick. See: http://www.mineral-forum.com/message-board/viewtopic.php?p=37646#37646 (Author: Antonio Alcaide)
Grossular.
Maine, USA
6 x 5 cm.
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Gypsum (arrow-head twin). 7 x 5 cm. Galera, Granada, Spain (Author: Antonio Alcaide)
Gypsum (arrow-head twin). 7 x 5 cm
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Gypsum (Var: Selenite)
Laguna del Rey in Coahuila, about 250km east of Naica.
13 x 11 cm (main crystal measuring 10 cm). From my personal collection (Author: Antonio Alcaide)
Gypsum (Var: Sele
Laguna del Rey in
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Gypsum crystal from Galera, Granada, Spain. 7,5 x 3,3 cm. Very similar to Andreas’ Stempeda gypsum, I hope. (Author: Antonio Alcaide)
Gypsum crystal from Galera, Granad
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Gypsum crystals from Galera. Granada. Spain. The whole set. (Author: Antonio Alcaide)
Gypsum crystals from Galera. Grana
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Gypsum pseudomorphs after glauberite. Camp Verde, Yavapai Co., Arizona. 7,5 x 7,5 cm. Main crystal measures 4 cm. on edge. Ex John R. Ydren collection. (Author: Antonio Alcaide)
Gypsum pseudomorphs after glauberi
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Hematite pseudomorph after magnetite.
Iron Springs District, Iron Co., Utah, USA
6 x 4 cm.
Main crystal = 3 cm. on edge.
It is still magnetic. Ex Gene and Sally LaBerge collection. (Author: Antonio Alcaide)
Hematite pseudomorph after magneti
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Inesite. Unnamed Brookite Occurrence, Hale-Creek Mad River Junction Area, Trinity Co., California. 5,5 x 4 cm. (Author: Antonio Alcaide)
Inesite. Unnamed Brookite Occurren
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Microcline. Baveno twin. Homestake Pass, Jefferson Co., Montana. 7,5 x 3 cm (Author: Antonio Alcaide)
Microcline. Baveno twin. Homestake
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Neptunite on crossite and natrolite matrix with tiny joaquinite crystals. Benitoite Gem Mine, San Benito Co., California. 8,5 x 6 cm. Main crystal measures 2 cm. (Author: Antonio Alcaide)
Neptunite on crossite and natrolit
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Obsidian ’Apache tears’ on perlite. Apache tears locality, Picketpost Mountain Area, Superior, Pinal Co., Arizona. 8 x 5,5 cm. (Author: Antonio Alcaide)
Obsidian ’Apache tears&rsquo
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One of my favourites. Simple in its beauty. Hanksite. Searles Lake, Trona, San Bernardino Co., California. Interesting species both sulphate and carbonate. Perfect hexagonal crystal with two pinacoids. 9,5 x 5,5 cm. (Author: Antonio Alcaide)
One of my favourites. Simple in it
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Pyrite
Rennselaer Quarry, Pleasant Ridge, Jasper Co., Indiana, USA
9 x 7 x 5 cm
Detail of the crystals (Author: Antonio Alcaide)
Pyrite
Rennselaer Quarry, Pleasant
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Pyrite
Rennselaer Quarry, Pleasant Ridge, Jasper Co., Indiana, USA
9 x 7 x 5 cm
Octahedron modified by cube. I have read Maggie Wilson telling on Mindat the pyrites from this find are often unstable. I am going to enjoy it quickly just in case... (Author: Antonio Alcaide)
Pyrite
Rennselaer Quarry, Pleasant
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Pyrite
TXI Cement Quarry, Ellis Co., Texas, USA
13 x 8 x 8 cm
Detail of the pyrite cluster. The faces of the cubes show hillocks and the octahedral faces have cuboctahedral growths. Not very common!! (Author: Antonio Alcaide)
Pyrite
TXI Cement Quarry, Ellis Co
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Pyrite
TXI Cement Quarry, Ellis Co., Texas, USA
13 x 8 x 8 cm
Cluster of cuboctahedral crystals of pyrite on limestone. (Author: Antonio Alcaide)
Pyrite
TXI Cement Quarry, Ellis Co
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Pyrophyllite. Graves Mountain, Lincoln Co., Georgia. 8 x 9 cm. (Author: Antonio Alcaide)
Pyrophyllite. Graves Mountain, Lin
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Stilbite
Teeter’s Quarry. Gettysburg. Adams Co. Pennsylvania, USA
9,5 x 5,5 cm. (Author: Antonio Alcaide)
Stilbite
Teeter’s Quarry. Ge
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Suphur with tiny calcite crystals. Maybee, Monroe Co., Michigan. 7,5 x 5 cm. Main crystal measuring 3 cm. (Author: Antonio Alcaide)
Suphur with tiny calcite crystals.
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Thenardite. Soda Lake, San Luis Obispo Co., California. 5,5 x 4,5 cm. A floater. (Author: Antonio Alcaide)
Thenardite. Soda Lake, San Luis Ob
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Wavellite
De Linde Pits, Dug Hill, Avant, Garland Co., Arkansas, USA
Close up of the previous piece. (Author: Antonio Alcaide)
Wavellite
De Linde Pits, Dug Hill,
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Wavellite
De Linde Pits, Dug Hill, Avant, Garland Co., Arkansas, USA
7,5 x 5 cm.
Wavellite on limestone matrix. (Author: Antonio Alcaide)
Wavellite
De Linde Pits, Dug Hill,
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Willemite and franklinite on calcite. Franklin, Sussex Co., New Jersey. 5,5 x 3 cm. Willemite crystal measures 2 x 1 cm. (Author: Antonio Alcaide)
Willemite and franklinite on calci
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Willemite crystal close-up (Author: Antonio Alcaide)
Willemite crystal close-up
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Willemite under UV lamp. It shows strong fluorescence (short wave) (Author: Antonio Alcaide)
Willemite under UV lamp. It shows
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Witherite and Fluorite. Minerva # 1 Mine, Cave-in-Rock, Hardin Co. Illinois. 8,5 x 6 x 5 cm. With pseudo hexagonal habit and fluorescent under UV (Author: Antonio Alcaide)
Witherite and Fluorite. Minerva #