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.
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.
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