File:Chalcopyrite and calcite (Sweetwater Mine, Missouri, USA).jpg
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English: Chalcopyrite-calcite from Missouri, USA.
Metallic-lustered & rainbow-colored = chalcopyrite (CuFeS2) Grayish, pointed crystals = calcite (CaCO3) 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 5900 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. Chalcopyrite is a copper iron sulfide mineral (CuFeS2). Many pyrite-like minerals exist, such as pyrite, marcasite, arsenopyrite, pyrrhotite, and chalcopyrite. Chalcopyrite has a metallic luster, a deep yellowish-brassy color, a dark gray streak, a hardness of about 3.5 to 4, and no cleavage. Many specimens have a multicolored iridescent tarnish, which can be artificially produced by exposure to certain chemicals - often acid. Chalcopyrite is an important copper ore mineral. The chalcopyrite-calcite plate seen here is from a lead-zinc mine in the Viburnum Trend of southeastern Missouri. The Viburnum Trend is a roughly north-south trending zone of sulfide mineralization hosted in Upper Cambrian sedimentary rocks. The principal target minerals in the Viburnum Trend are galena and sphalerite, which are processed into lead and zinc. Numerous gangue minerals are also present. Mineralization in the Viburnum Trend is mostly in carbonate rocks of the Bonneterre Formation (Upper Cambrian). Orebody mapping has shown that mineralization occurred as basinal fluids traveled through the underlying Lamotte Sandstone (also Upper Cambrian) and rose up or around Precambrian basement highs that likely represented islands in a Late Cambrian sea. Mineralization probably occurred in the Late Paleozoic or Mesozoic. Locality: Sweetwater Mine, Viburnum Trend Mining District, Southeast Missouri Lead District, Reynolds County, southeastern Missouri, USA Locality info. at: www.mindat.org/loc-3866.html [Scroll down for a geologic summary of the Viburnum Trend.] Photo gallery of chalcopyrite: www.mindat.org/gallery.php?min=955 Some info. from: Hagni (2006) - Directions of ore fluid flow in the Southeast Missouri Lead-Zinc District as inferred from asymmetrical distributions of orebodies around Precambrian knobs and from mineral/metal zoning patterns. Society for Mining, Metallurgy & Exploration Annual Meeting, March 27-March 29, 2006, St. Louis, Missouri Preprint 06-040. 15 pp. |
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| Source | https://www.flickr.com/photos/47445767@N05/52852477866/ |
| 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@N05/52852477866. It was reviewed on 30 April 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 18:05, 30 April 2023 | | 3,277 × 2,140 (5.98 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52852477866/ with UploadWizard |
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