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chalcocite

[kal-kuh-sahyt]
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noun
  1. a common mineral, cuprous sulfide, Cu2S: an important ore of copper.

Origin of chalcocite

1865–70; irregular chalco- + (anthra)cite
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for chalcocite

Historical Examples

  • No traces of other primary minerals are present and the chalcocite here is regarded as probably primary.

    The Economic Aspect of Geology

    C. K. Leith

  • In the United Verde Mine, oxidizing conditions at present prevail to the bottom of the chalcocite zone.

  • Copper pyrites (or yellow ore), erubescite (or purple ore), and chalcocite (or grey ore) are the most important.

  • Chalcocite occurs in vein deposits as one of the important copper ores, especially at Butte, Montana.

    Geology

    William J. Miller

  • The mineral is harder than chalcocite, but less hard than pyrite, being easily scratched with a knife.


British Dictionary definitions for chalcocite

chalcocite

noun
  1. a lead-grey or black mineral, found as a copper ore or in veins. It is a source of copper. Composition: copper sulphide. Formula: Cu 2 S. Crystal structure: orthorhombic

Word Origin

C19: changed from earlier chalcosine, from Greek khalkos copper + -ite 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012