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A dark gray mineral, essentially Cu2S, that is an important ore of copper.

[Alteration of obsolete chalcosine, from Greek khalkos, copper.]


(Minerals) a lead-grey or black mineral, found as a copper ore or in veins. It is a source of copper. Composition: copper sulphide. Formula: Cu2S. Crystal structure: orthorhombic
[C19: changed from earlier chalcosine, from Greek khalkos copper + -ite1]


(ˈkæl kəˌsaɪt)

a common mineral, cuprous sulfide, Cu2S: an important ore of copper.
[1865–70; chalco- + (anthra) cite]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.chalcocite - a heavy grey mineral that is an ore of copper
atomic number 29, copper, Cu - a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition