File:Calcite over stilbite (Stillwater Mine, Beartooth Mountains, Montana, USA) 3.jpg
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| Description |
English: Seen here are honey yellow calcite crystals over whitish stilbite crystals. The sample comes from an underground mine in Montana - the famous Stillwater Mine, which produces platinum and palladium. The platinum ores are very old, Precambrian rocks. The calcite and stilbite are late-stage, fracture-lining mineralization unrelated to the formation of those rocks. Calcite is calcium carbonate (CaCO3), a common mineral. Stilbite is hydrous sodium calcium aluminosilicate (NaCa2Al5Si13O36·14H2O), one of the zeolite minerals.
The grayish-colored matrix is the host rock, which is an altered norite having plagioclase feldspar (= gray), clay after plagioclase (= whitish gray), and an undetermined, dark greenish-colored mineral after bronzite pyroxene. Geologic context: crystal-lined, open fracture in rocks of the Johns-Manville Reef, Troctolite-Anorthosite I zone, Lower Banded Series, Stillwater Complex, upper Neoarchean, 2.7 Ga Locality: Stillwater Mine, southwest of the town of Nye, southwestern Stillwater County, Beartooth Mountains, southern Montana, USA Photo gallery of calcite: www.mindat.org/gallery.php?min=859 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50820244011/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50820244011. It was reviewed on 11 January 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 14:40, 11 January 2021 | | 2,186 × 1,448 (2.01 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50820244011/ with UploadWizard |
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