a common mineral, cuprous sulfide, Cu 2 S: an important ore of copper.

1865–70; irregular chalco- + (anthra)cite Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chalcocite (ˈkælkəˌsaɪt)
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]

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Example sentences
Supergene copper as chalcocite may form blanket below leached zone.
Chalcocite is sometimes found as a primary vein mineral in hydrothermal veins.
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