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Acanthite : Ag2S, Rhodochrosite : MnCO3 | |
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Zanett tunnel, Grizzly Bear Mine, Ouray, Ouray District (Uncompahgre District), Ouray Co., Colorado, USA Acanthite with rhodochrosite, quartz, and pyrite. Field of view is 9.4 mm. The acanthite seems to grow on native silver after the specimen is collected. My theory is that the presents of sulfides (pyrite) produces this growth. Specimen collected by Dorothy Atlee at the Zannet tunnel; Ouray, Colorado, USA and photo by Phil McCollum. |
| Photo ID: 134129 View Count: 209 | |
Anatase : TiO2, Brookite : TiO2 | |
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Silver Mountain Mine, Ouray District (Uncompahgre District), Ouray Co., Colorado, USA Brookite crystals on anatase. Anatase crystal .085 mm long. Photograph by Phil McCollum |
| Photo ID: 139934 View Count: 166 | |
Baryte : BaSO4, Quartz : SiO2 | |
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Portland Mine, Amphitheater, Ouray, Ouray District (Uncompahgre District), Ouray Co., Colorado, USA White bladed barite crystals up to 2 cm on knob-shaped formation coated with druzy gray quartz crystals. Fully crystallized on all sides. Bottom sawn flat. No damage. Overall size of mineral specimen: 9x9x7 cm. Size of individual crystals: 1-20 mm. |
| © 2002 John H. Betts | Photo ID: 3415 View Count: 487 |
Calcite : CaCO3, Dolomite (Var: Ferroan Dolomite) : CaMg(CO3)2 | |
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Ouray District (Uncompahgre District), Ouray Co., Colorado, USA Distinct growth pattern in a broken calcite crystal that is surrounded by ferroan dolomite. Collected in August 1980. Alan Goldstein specimen (1033) and photo. FOV = 1 cm |
| © Alan Goldstein | Photo ID: 29140 View Count: 323 |
Calcite : CaCO3 | |
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Goodfro mine, Ouray, Ouray District (Uncompahgre District), Ouray Co., Colorado, USA Hundreds of parallel aligned scalenohedrons make up a larger crystal on a chalcareous matrix. 7cm X 6.5cm X 7cm |
| © Geoffrey Krasnov | Photo ID: 92378 View Count: 83 |
Chalcopyrite : CuFeS2, Chalcocite : Cu2S | |
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2100 Level, Campbell Mine, Ouray District (Uncompahgre District), Ouray Co., Colorado, USA 2.3 x 1.4 x 1.3 cm. Here is a fabulous thumber for either a thumbnail collector or a Colorado collector: a very sharp TWIN of chalcopyrite with a coating of chalcocite which gives it its blue and gold iridescence. This is from the classic Ouray mining district, and is an old-timer and very hard to find now! |
| © Rob Lavinsky | Photo ID: 118543 View Count: 91 |
Dolomite (Var: Ferroan Dolomite) : CaMg(CO3)2, Calcite : CaCO3, Quartz : SiO2 | |
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Ouray, Ouray District (Uncompahgre District), Ouray Co., Colorado, USA Ferroan dolomite coating calcite sprinkled with quartz. Note the zones in broken calcite crystals. Collected in August 1980. Alan Goldstein specimen (1033) and photo. |
| © Alan Goldstein | Photo ID: 29139 View Count: 357 |
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Ouray, Ouray District (Uncompahgre District), Ouray Co., Colorado, USA Exceptional specimen for the locality. Very aerial Enargite crystals, with well defined faces and edges showing an excellent luster. Perfect terminal faces, also very bright. On matrix. The specimen is from the James Catmur collection. Longfellow Mine, Ouray, Ouray County, Colorado, USA. Specimen size: 4.9 × 4.2 × 3.7 cm Main crystal ... |
| © fabreminerals.com | Photo ID: 179511 View Count: 127 |
Fluorite : CaF2, Quartz : SiO2 | |
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Zanett tunnel, Grizzly Bear Mine, Ouray, Ouray District (Uncompahgre District), Ouray Co., Colorado, USA 4.5 x 3.3 x 2.9 cm. A good representative Fluorite specimen from the Grizzly Bear mine featuring a few colorless cubic crystals resembling tumbling dice, which are sitting atop sparkling Quartz crystals on massive sulfide matrix. The largest Fluorite cube measures 8 mm on edge. Ex. Jaime Bird Collection. |
| © Rob Lavinsky | Photo ID: 221293 View Count: 26 |
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Ouray, Ouray District (Uncompahgre District), Ouray Co., Colorado, USA 4.0 x 3.1 x 2.4 cm. A SHOWY gold ore specimen with bright, variable patina, microcrystalline gold RICHLY scattered on both sides of milky quartz matrix and nicely complimented with splendent, gray sulfides from an unknown mine near Ouray, Colorado. Excellent material. |
| © Rob Lavinsky | Photo ID: 122768 View Count: 188 |
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