File:Uranocircite (Streuberg, Saxony, Germany).jpg
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Uranocircite from Germany. (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). Uranocircite is a scarce hydrous barium uranyl phosphate mineral, Ba(UO2)2(PO4)2·10H2O. It has a nonmetallic luster, a yellow to yellowish-green color, is fairly soft (H = 2 to 2.5 on the Mohs Hardness Scale), and is radioactive. Uranocircite 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, barium, and phosphorus, uranocircite can form. The uranocircite specimen seen above is from the Bergen Uranium Deposit in Saxony, Germany. Uranium mineralization occurs in the mid-Carboniferous aged Bergen Granite. Locality: Streuberg Quarry or uranium mine near the town of Bergen, between Plauen & Falkenstein, southwestern Saxony, eastern Germany Photo gallery of uranocircite: www.mindat.org/gallery.php?min=4105 |
| Date | |
| Source | Uranocircite (Streuberg, Saxony, Germany) |
| 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@N05/27183750675. It was reviewed on 23 November 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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