Granite with tantalite & lepidolite (Spokane Mine, Black Hills, South Dakota, USA) 2 : 無料・フリー素材/写真
Granite with tantalite & lepidolite (Spokane Mine, Black Hills, South Dakota, USA) 2 / 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 | Granite with tantalite & lepidolite from South Dakota, USA. (Karl E. Limper Geology Museum collection, Miami University, Oxford, Ohio, USA)The coarsely-crystalline granite seen here is a pegmatite, an intrusive igneous rock having crystals greater than 1 centimeter in size. Most pegmatites by cooling of water-rich, felsic magma. Dominant minerals in pegmatites are quartz, feldspar, and mica. Unusual minerals can be common in pegmatites, such as tourmaline, beryl, and uraninite. This example is mostly quartz and potassium feldspar, but it also has the scarce minerals tantalite and lepidolite. Tantalite is a black-colored, tantalum-bearing oxide mineral, (Fe,Mn)Ta2O6 - iron manganese tantalum oxide. Lepidolite is lithium mica, KLi2Al(Al,Si)3O10(F,OH)2 - potassium lithium fluoro-hydroxy-aluminosilicate.------------------------------------Exhibit info.:The mineral tantalite is the primary source of the metal tantalum, which has many uses, including in electronic components such as capacitors and high-power resistors. It is also used in superalloys that comprise components for jet engines, missiles, and nuclear reactors, to name a few.------------------------------------Locality: Bob Ingersoll Mine, northwest of the town of Keystone, Black Hills, western South Dakota, USA |
| 撮影日 | 2025-04-26 13:53:52 |
| 撮影者 | James St. John |
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