File:Chalcocite (Late Jurassic; Lavendar Open Pit Mine, Bisbee, Arizona, USA) 3.jpg
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| Description |
English: Chalcocite from the Jurassic of Arizona, 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. Chalcocite is a significant copper ore mineral having the formula Cu2S - copper sulfide. It has a metallic luster, a dark gray to black color and streak, no obvious cleavage, is moderately heavy for its size, and is moderately soft (H = 2.5 to 3). Chalcocite is found with other copper minerals such as chalcopyrite. It usually forms in the near-surface, secondary enrichment zone at and below the water table, in areas having copper mineralization. It also occurs as a primary mineral in some hydrothermal veins. This sample is from a polymetallic mine in Bisbee, Arizona. It's apparently from a supergene zone chalcocite blanket formed during the Late Jurassic, prior to deposition of overlying Lower Cretaceous sedimentary rocks. The chalcocite formed by oxidation, leaching, and redeposition of copper in a primary pyrite-bornite-chalcopyrite-mineralized, brecciated composite intrusion called the Sacramento Stock. The intrusion formed during the Jurassic, at about 168 to 178 million years ago. Locality: Lavendar Open Pit Mine, Bisbee, Mule Mountains, Warren Mining District, southern Cochise County, southeastern Arizona, USA (vicinity of 31° 25' 52" North latitude, 109° 54' 00" West longitude) See locality info. at: www.mindat.org/loc-3304.html Photo gallery of chalcocite: www.mindat.org/gallery.php?min=962 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50712175658/ |
| 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@N05/50712175658. 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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| current | 19:37, 14 December 2020 | | 2,739 × 2,268 (5.32 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50712175658/ with UploadWizard |
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