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Ag3SbS3 A deep ruby-red to black mineral, crystallizing in the hexagonal system, occurring in massive form and in disseminated grains, and having an adamantine luster; hardness is 2.5 on Mohs scale, and specific gravity is 5.85; an important silver ore. Also known as dark-red silver ore; dark ruby silver.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a mineral with composition Ag3SbS3, containing 59.76 percent Ag, 22.48 percent Sb, and 17.76 percent S. Pyrargyrite crystallizes in the trigonal system. It occurs as irregularly shaped grains and their aggregates and in the form of prismatic crystals. It is dark red, with an adamantine luster. A brittle mineral, it has a hardness of 2.5 on Mohs’ scale and a density of 5,770–5,860 kg/m3.

Pyrargyrite is not a widely occurring mineral. It forms in hydrothermal deposits at moderate or low temperatures. In the USSR, deposits are found in the Urals, Middle Asia, Transbaikalia, the Yakut ASSR, and the Far East. Other deposits are found in the German Democratic Republic, the Federal Republic of Germany, Czechoslovakia, Mexico, Chile, and Bolivia. Along with other silver-bearing minerals, pyrargyrite is an important ore of silver.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.