File:Cuprite-coated native copper.jpg
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English: 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 oxide minerals all contain one or more oxide anions (O-2). The oxide minerals include species that are hydroxy-oxides. The hydroxide minerals (those with one or more OH-) are usually considered together with the oxides. Many sulfide minerals are not stable in Earth-surface conditions. In the presence of oxygen and moisture, sulfide minerals tend to tarnish or alter to oxides and hydroxy-oxides. All except the most inert elements (such as the platinum-group elements and gold and noble gases) readily form oxides. Gold oxide forms only under special conditions. Cuprite is a reddish- to almost black-colored copper oxide mineral, Cu2O - it’s often nicknamed “ruby copper ore”. It is strictly a supergene mineral; it forms on sulfides or previously-existing copper metal. Cuprite can form cubic or octahedral crystals, but it is often massive. Potentially, cuprite might be mistaken for other minerals such as hematite or cinnabar, but cuprite has a distinctive hardness (H = 4 on the Mohs Hardness Scale) and is always associated with copper minerals. As copper metal weathers, a coating of reddish cuprite forms and a black coating of tenorite (CuO) comes later. Cuprite and tenorite combine with gases in air to form green coatings of malachite (Cu2CO3(OH2)). Locality: unrecorded/undisclosed site (but probably from the Proterozoic of Michigan's Upper Peninsula, USA) ------------------ Photo gallery of cuprite: www.mindat.org/gallery.php?min=1172 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/53197619673/ |
| 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@N05/53197619673. It was reviewed on 19 September 2023 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 | 17:25, 19 September 2023 | | 1,014 × 931 (1.71 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53197619673/ with UploadWizard |
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