File:Digenite-pyrite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Leonard Mine, Butte, Montana, USA) 11.jpg
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| Description |
English: Digenite-pyrite hydrothermal vein sample from Montana, USA.
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5600 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. The sulfide minerals contain one or more sulfide anions (S-2). The sulfides are usually considered together with the arsenide minerals, the sulfarsenide minerals, and the telluride minerals. Many sulfides are economically significant, as they occur commonly in ores. The metals that combine with S-2 are mainly Fe, Cu, Ni, Ag, etc. Most sulfides have a metallic luster, are moderately soft, and are noticeably heavy for their size. These minerals will not form in the presence of free oxygen. Under an oxygen-rich atmosphere, sulfide minerals tend to chemically weather to various oxide and hydroxide minerals. Digenite is a scarce copper sulfide mineral, Cu9S5. It has a metallic luster, dark bluish-gray to blackish color, dark gray streak, and a Mohs hardness of 2.5 to 3. It’s usually massive, but can form pseudocubic crystals. Broken surfaces show conchoidal fracture. Primary digenite occurs in some copper-bearing hydrothermal veins, some intrusive igneous rocks, and in some sulfide exhalative deposits. The digenite sample seen here is from Montana's Butte Mining District. In this area, digenite occurs in 62 to 66 million year old copper sulfide-rich hydrothermal veins that intrude the Butte Quartz Monzonite, a pluton of the Boulder Batholith (mid-Campanian Stage, late Late Cretaceous, 76 million years). Locality: Leonard Mine, Butte Mining District, Silver Bow County, southwestern Montana, USA Photo gallery of digenite: www.mindat.org/gallery.php?min=1291 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50716727028/ |
| 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@N05/50716727028. It was reviewed on 14 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 19:36, 14 December 2020 | | 2,236 × 2,038 (3.74 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50716727028/ with UploadWizard |
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