Definition of chalcocite in English:

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chalcocite

Pronunciation: /ˈkalkəˌsīt/

noun

Cuprous sulfide, an ore of copper, usually occurring as black, fine-grained masses.
  • Chemical formula: Cu2S.
Example sentences
  • 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.

For editors and proofreaders

Syllabification: chal·co·cite

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