File:Tellurium-quartz-pyrite hydrothermal vein (Emperor Gold-Silver Telluride Deposit, Mba Volcanics, Miocene; Emperor Mine, Viti Levu, Fiji Islands) (17333016059).jpg
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| Description |
Tellurium-quartz-pyrite hydrothermal vein from the Miocene of the Fiji Islands. (field of view 2.7 cm across) Silvery-colored = tellurium Whitish-gray = quartz Brassy gold = pyrite Dark material at right = host rock (altered porphyritic shoshonite) 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. Elements are fundamental substances of matter - matter that is composed of the same types of atoms. At present, 118 elements are known (four of them are still unnamed). Of these, 98 occur naturally on Earth (hydrogen to californium). Most of these occur in rocks & minerals, although some occur in very small, trace amounts. Only some elements occur in their native elemental state as minerals. To find a native element in nature, it must be relatively non-reactive and there must be some concentration process. Metallic, semimetallic (metalloid), and nonmetallic elements are known in their native state. Tellurium (Te) is a semimetal/metalloid that can occur in its native state as a mineral. It has a metallic luster, a bright silvery color, a grayish streak, is rather soft (H = 2 to 2.5), and is heavy for its size. It is not malleable. Tellurium can break along several cleavage planes. Tellurium is best known from precious metal telluride deposits, such as the Cripple Creek Mining District of Colorado, USA. In such deposits, Te is usually mixed with various metals and semimetals (e.g., Au, Ag, Pb, Ni, Fe, Bi, Sb). The sample shown above is a tellurium-quartz-pyrite hydrothermal vein that is hosted in altered porphyritic shoshonite lava (see rock matrix at right). Deposit & age: Emperor Gold-Silver Telluride Deposit, Mba Volcanics, Miocene Locality: Emperor Mine, near Vatukoula, Tavua Gold Field, northern Viti Levu, western Fiji Islands, southwest-central Pacific Basin (17º 30’ 24” South, 177º 51’ 12” East) |
| Date | |
| Source | Tellurium-quartz-pyrite hydrothermal vein (Emperor Gold-Silver Telluride Deposit, Mba Volcanics, Miocene; Emperor Mine, Viti Levu, Fiji Islands) |
| 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@N05/17333016059 (archive). It was reviewed on 4 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 | 14:41, 4 November 2019 | | 2,128 × 1,639 (3.22 MB) | Ainz Ooal Gown (talk | contribs) | Transferred from Flickr via #flickr2commons |
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