Meta-torbernite on granite (A Mine, Avery County, North Carolina, USA) 1 : 無料・フリー素材/写真
Meta-torbernite on granite (A Mine, Avery County, North Carolina, USA) 1 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Meta-torbernite on granite from North Carolina, USA.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 6100 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 meta-torbernite 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. Meta-torbernite 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 meta-torbernite.Locality: A Mine, Hanging Rock Road, Avery County, western North Carolina, USA---------------Photo gallery of torbernite:www.mindat.org/gallery.php?min=3997---------------Photo gallery of metatorbernite:www.mindat.org/gallery.php?min=2689 |
| 撮影日 | 2025-04-26 13:16:24 |
| 撮影者 | James St. John |
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