单词	chalcocite
释义	chalcocite /ˈkalkəˌsīt / noun Cuprous sulfide, an ore of copper, usually occurring as black, fine-grained masses. Chemical formula: Cu2S. Numerous fissure veins and fracture planes were present that contained brittle arsenical copper and chalcocite.... We have seen sooty black material associated with native copper from the Eagle mine that is almost certainly chalcocite. At the Kingston mine, calcite occurred as thin massive veins cutting the lode and as modified rhombohedral crystals to 7 mm with inclusions of cuprite and chalcocite.
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