The sulfo-salts, which are much rarer than sulfides, have the general formula AMBNXP, where A is commonly Ag, Cu, or Pb, B is commonly As, Sb, or Bi, and X is S. The sulfide and sulfo-salt minerals are generally opaque, heavy and have a metallic to sub-metallic lustre.
Tetrahedrite – (Cu,Ag)12Sb4S13
Tennantite – (Cu,Ag)12As4S13
Enargite – Cu3AsS4
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