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a sulfide mineral of copper and silver (CuAgS) that occurs as compact masses with copper and lead minerals in deposits at Altai, Siberia, Russia; Santiago, Chile; and Butte, Mont., U.S. Stromeyerite is a member of a group of sulfide minerals that form crystals of the isometric system at high temperatures but assume other symmetries upon cooling. The low-temperature form (below 93C) of stromeyerite is orthorhombic. For detailed physical properties, see sulfide mineral (table)