File:Sylvanite (Spotted Horse Mine, Lewistown, Montana, USA) 1.jpg
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English: Sylvanite from Montana, USA. (public display, Montana Bureau of Mines and Geology Mineral Museum, Butte, Montana, 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 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 telluride minerals contain one or more telluride anions (Te-2). The tellurides are usually considered together with the sulfide minerals, the arsenide minerals, and the sulfarsenide minerals. Sylvanite is a rare precious metal telluride mineral, (Au,Ag)2Te4 - gold silver telluride. This mineral volatilizes at relatively low temperatures. With heating, the tellurium component of sylvanite readily vaporizes, leaving behind blebs of gold/silver. Sylvanite has a metallic luster, a bright silver color, is fairly soft, and usually occurs in the form of elongated blades or small granular masses. It is known from only a few scattered localities on Earth and occurs with other telluride minerals such as calaverite (AuTe2 - gold telluride). Sylvanite is an important gold/silver ore mineral in precious metal telluride deposits such as the Golden Quadrilateral in Romania, near Kalgoorlie in western Australia, and the Cripple Creek Diatreme in Colorado, USA. Locality: Spotted Horse Mine, Lewistown, Fergus County, central Montana, USA Photo gallery of sylvanite: www.mindat.org/gallery.php?min=3849 |
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| Source | https://www.flickr.com/photos/47445767@N05/19738078935/ |
| Author | jsj1771 |
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