File:Torbernite (Margabal Mine, Aveyron Department, France) 2.jpg
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| Description |
English: Torbernite from France. (Robert Lauf collection)
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 4900 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 phosphate minerals have one or more phosphate anions (PO4-3). Torbernite and metatorbernite are scarce hydrous copper uranyl phosphate minerals. They have a nonmetallic luster, deep green color, light green streak, are fairly soft (H=2.5), typically have tabular crystals forming closely-packed clusters, and are radioactive. These minerals are principally valued as collector specimens and not as ore minerals of uranium. Torbernite is Cu(UO2)2(PO4)2·10H2O. Metatorbernite is Cu(UO2)2(PO4)2·8H2O - it forms by partial dehydration of torbernite. Torbernite is a secondary uranium mineral that forms by alteration of uraninite (or other primary U minerals) in an oxidizing environment. The original U+4 ions in uraninite get oxidized into U+6 and usually become incorporated into uranyl ions, (UO2)+2. In the presence of water, copper, and phosphorus, torbernite can form. In dry air, torbernite alters to metatorbernite. Locality: Margabal Mine, Aveyron Department, southern France Photo gallery of torbernite: www.mindat.org/gallery.php?min=3997 Photo gallery of metatorbernite: www.mindat.org/gallery.php?min=2689 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/26549558943/ |
| 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@N05/26549558943. It was reviewed on 29 August 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 02:10, 29 August 2020 | | 1,969 × 2,252 (3.89 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/26549558943/ with UploadWizard |
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