File:Sperrylite on bornite (Russia) 2 (19286144331).jpg
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| Description |
Sperrylite-bornite from Russia. (public display, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA) Silvery-colored = sperrylite Dull bluish-gray = bornite 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 arsenide minerals contain one or more arsenide anions (As-3). The arsenides are usually considered together with the sulfide minerals, the sulfarsenide minerals, and the telluride minerals. Sperrylite is a very rare platinum arsenide mineral (PtAs2). Very few localities on Earth have been reported to have sperrylite. The two classic localities for this mineral are Sudbury, Ontario, Canada and the Norilsk Mining District in northern Siberia. Sperrylite has a metallic luster, a bright silvery color, a dark gray to black streak, is fairly hard (H = 6 to 7), and is quite heavy for its size. It forms crystals in the isometric system, resulting in octahedrons and octahedrons truncated by cubic forms. Photo gallery of sperrylite: www.mindat.org/gallery.php?min=3723 |
| Date | |
| Source | Sperrylite on bornite (Russia) 2 |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/19286144331. It was reviewed on 15 July 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 21:59, 15 July 2015 | | 1,211 × 1,238 (1.46 MB) | Natuur12 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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