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chalcocite
(redirected from Copper-glance)

    Also found in: Wikipedia 0.02 sec.

chalcocite

Enlarge picture
Chalcocite from Bristol, Conn.
(credit: Emil Javorsky)
Sulfide mineral, Cu2S, that may be an important ore of copper. It belongs to a group of sulfide minerals formed at relatively low temperatures. Chalcocite alters to native copper and other copper minerals. Valuable deposits occur in Nevada and Arizona, where other components of the original rock have been dissolved away; chalcocite is also found with bornite in sulfide veins in Montana and Namibia.

chalcocite [′kal·kə‚sīt]
(mineralogy)
Cu2S A fine-grained, massive mineral with a metallic luster which tarnishes to dull black on exposure; crystallizes in the orthorhombic system, the crystals being rare and small usually with hexagonal outline as a result of twinning; hardness is 2.5-3 on Mohs scale, and specific gravity is 5.5-5.8. Also known as beta chalcocite; chalcosine; copper glance; redruthite; vitreous copper.


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