File:Uraninite in pegmatite (Ingelsbo Pegmatite; Ingelsbo, Sweden) 1 (26901187545).jpg
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| Description |
Uraninite in pegmatitic granite from Sweden. (Robert Lauf collection) Black crystal = uraninite Mottled buff to brown material = potassium feldspar Shiny flakes = mica 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 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. Uraninite is a scarce uranium oxide mineral, UO2. Uranium is a radioactive element and uraninite is a primary uranium mineral. It forms under non-oxidizing conditions - in such environments, the uranium is in the form of U+4 ions. In an oxidizing environment, such as the Earth's surface, uraninite alters to secondary uranium minerals having U+6 ions, which are usually incorporated into uranyl ions, (UO2)+2. Uraninite is black, moderately hard, and radioactive. It occurs in some pegmatites, in some hydrothermal veins, and in some sedimentary rocks. The Swedish rock shown above is a sample of the Ingelsbo Pegmatite with potassium feldspar and mica. The black cubic crystal is uraninite within a feldspar crystal. Locality: Ingelsbo, southeastern Dalarna Province, Sweden Photo gallery of uraninite: <a href="http://www.mindat.org/gallery.php?min=4102" rel="nofollow">www.mindat.org/gallery.php?min=4102</a> |
| Date | |
| Source | Uraninite in pegmatite (Ingelsbo Pegmatite; Ingelsbo, Sweden) 1 |
| 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@N05/26901187545. It was reviewed on 12 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 04:15, 12 November 2019 | | 1,339 × 1,376 (1.74 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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