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A black mineral with a metallic luster, essentially (Ag,Cu)16Sb2S11, that is an ore of silver.
(Minerals) a grey to black mineral consisting of a sulphide of silver, antimony, and copper in the form of platelike monoclinic crystals. It occurs in veins of silver ore. Formula: (Ag,Cu)16Sb2S11
[C19: from poly- + base1 + -ite1]