a common mineral, cuprous sulfide, Cu2S: an important ore of copper.
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How to use chalcocite in a sentence
Copper pyrites (or yellow ore), erubescite (or purple ore), and chalcocite (or grey ore) are the most important.A Textbook of Assaying: For the Use of Those Connected with Mines. | Cornelius Beringer and John Jacob Beringer
chalcocite occurs in vein deposits as one of the important copper ores, especially at Butte, Montana.Geology | William J. Miller
The ore chalcocite, sometimes called copper glance, has a metallic luster, often tarnished green or blue.
Both chalcocite and chalcopyrite frequently occur in silver-bearing rocks.
The mineral is harder than chalcocite, but less hard than pyrite, being easily scratched with a knife.
British Dictionary definitions for chalcocite
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
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