The mining product next in value to coal in 1908 was copper, taken chiefly in Carbon county in a zone of brecciated quartzite underlying schist, the original ore being chalcopyrite, with possibly some pyrite, a secondary enrichment, which has produced important bodies of chalcocite in the upper workings, but these are replaced by chalcopyrite at greater depth.
The principal ores of copper are the oxides cuprite and melaconite, the carbonates malachite and chessylite, the basic chloride atacamite, the silicate chrysocolla, the sulphides chalcocite, chalcopyrite, erubescite and tetrahedrite.
Chalcocite, redruthite, copper-glance or vitreous copper (Cu 2 S) contains about 80% of copper.
Cuprous sulphide, Cu 2 S, occurs in nature as the mineral chalcocite or copper-glance, and may be obtained as a black brittle mass by the direct combination of its constituents.
By definition is contains chalcopyrite together with covellite, chalcocite and digenite (and rare bornite ).
chalcocite Secondary mineral in or near the oxidized zone of copper sulfide deposits: Cu2S.
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