|PROUSTITE MINERAL FACTS|
|The Gem and Mineral Collector's Photo Gallery by Nevada Outback|
Proustite Mineral Facts:
Chemical Formula: AgAsS3 (Light Ruby Silver)Sulfo-arsenite of silver, silver is 64.5 % by weight. May contain a small amount of antimony substituting for arsenic.
Ruby Red to Brownish red
Cleavage: Imperfect, but it is easily sectile, and can be cut with a knife like lead.
Luster:. Adamantine luster. Transparent to translucent. High refractive index.
Optics: (Refractive Index): w= 3.0877, e= 2.7924
Identification and Diagnostics
Localities and Origins:
Handsome crystal specimens of proustite occur at Freiberg and other places in Saxony, at Wolfach in Baden, at Markirchen in Alsace and at Chanarcillo in Chile. It is associated with pyrargyrite and with other ores of silver. In parts of the western United States it is quite abundant, more particularly in the Ruby district, Colorado, at Poorman lode in Idaho, and in all other localities where pyrargyrite occurs. In some locations it is an important silver ore.
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Please note that the author, Chris Ralph, retains all copyrights to this entire document and it may not be reproduced, quoted or copied without permission.
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