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chalcocite

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chalcocite

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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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We expect that our current drilling program, combined with the historical drill results reported by Santa Fe and other companies, will allow Aurelio to further quantify both a near-surface oxide copper resource and a deeper, higher-grade copper-zinc-gold-silver resource hosted in a combination of chalcocite replacement blanket and skarn/carbonate replacement deposits.
Fred Warnaars, President and CEO, Reports Continuing Drill Results ... by Business Wire
The claims cover outcrops with visible malachite, azurite and chalcocite.
Tri-Valley Unit Announces the Addition of Two Copper Properties to ... by Business Wire
Copper, with grades shown in Table 2, is mainly contained in chalcopyrite, bornite, chalcocite, and copper carbonates in the oxide zone.
Drilling Intersects 116 m @ 0.61 % Cu on the East Camp Skarn Target ... by Business Wire
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