Cuprous sulfide, an ore of copper, usually occurring as black, fine-grained masses.
Chemical formula: Cu₂S
Example sentencesExamples
Cuprite occurred along with chalcocite as inclusions in small calcite crystals.
Numerous fissure veins and fracture planes were present that contained brittle arsenical copper and chalcocite.
Some specimen labels state that this coating is chalcocite, but, to the best of my knowledge, the identity has not been established by analysis.
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.
We have seen sooty black material associated with native copper from the Eagle mine that is almost certainly chalcocite.
Definition of chalcocite in US English:
chalcocite
nounˈkalkəˌsīt
Cuprous sulfide, an ore of copper, usually occurring as black, fine-grained masses.
Chemical formula: Cu₂S
Example sentencesExamples
Some specimen labels state that this coating is chalcocite, but, to the best of my knowledge, the identity has not been established by analysis.
Cuprite occurred along with chalcocite as inclusions in small calcite crystals.
We have seen sooty black material associated with native copper from the Eagle mine that is almost certainly chalcocite.
Numerous fissure veins and fracture planes were present that contained brittle arsenical copper and 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.