chalcocite

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chal·co·cite

 (kăl′kə-sīt′)
n.
A dark gray mineral, essentially Cu2S, that is an important ore of copper.

[Alteration of obsolete chalcosine, from Greek khalkos, copper.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

chalcocite

(ˈkælkəˌsaɪt)
n
(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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

chal•co•cite

(ˈkæl kəˌsaɪt)

n.
a common mineral, cuprous sulfide, Cu2S: an important ore of copper.
[1865–70; chalco- + (anthra) cite]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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
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