polybasite /ˌpɒlɪˈbeɪsaɪt, pəˈlɪbəˌsaɪt/

• 1. 

  N 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 硫锑铜银矿