File:Sylvanite on quartz (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Portland Mine, Victor, Colorado, USA) 2 (49216770252).jpg
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Sylvanite on quartz from the Oligocene of Colorado, USA. (DMNH 2191, Denver Museum of Nature & Science, Denver, Colorado, 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 5500 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: Portland Mine, Cripple Creek Mining District, town of Victor, Colorado, USA Photo gallery of sylvanite: <a href="http://www.mindat.org/gallery.php?min=3849" rel="noreferrer nofollow">www.mindat.org/gallery.php?min=3849</a> |
| Date | |
| Source | Sylvanite on quartz (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Portland Mine, Victor, Colorado, USA) 2 |
| 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@N05/49216770252 (archive). It was reviewed on 15 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 18:29, 15 December 2019 | | 2,727 × 2,362 (3.76 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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