Copper glance

The compound occurs in nature as the mineral chalcocite (copper glance) with varying colors. 

The word chalcocite is derived from the Greek word meaning "copper." Chalcocite also is known as copper glance. 

Cuprous Sulfide, CUjS,mw 159 20, blk solid, mp ca 1100° occurs as the mineral chalcocite (copper glance). Can be prepd by heating CuS in a stream of hydrogen or by other methods (Refs 1, 2, 4 7). Used in protective paint for vessels (Ref 9, P 321... 

Several methods are applicable to the production of cupric sulphate on the manufacturing scale. Old copper plates are heated with excess of sulphur to bright redness in a reverberatory furnace with closed doors until combination is complete. The doors are then opened, and the mass is oxidized at dull-red heat. When oxidation is complete, the hot product is transferred into dilute sulphuric acid, and the dear solution concentrated after decantation. The crystals formed are of a moderate degree of purity. The process is also applicable to coarse copper, and to copper-glance and other sulphur ores or copper. 

Cbalcocite (copper glance) CU2S 79.8 Dark gray 5.7... 

Today, essentially all copper is obtained from minerals such as azurite, or basic copper carbonate (Cu2(0H)2C03) chalcocite, or copper glance or copper sulfide (CU2S) chalcopyrite, or copper pyrites or copper iron sulfide (CuFeS2) cuprite, or copper oxide (CU2O) and malachite, or basic copper carbonate (Cu2(0H)2C03). 

Cuprous Sulfide. CujS, mol wt 159.15. Cu 79.85%, S 20.15%. Occurs in nature as the mineral chatco-citr also called copper glance (grey, black, green, blue, or violet rhombic crystals). Prepn Glemser, Sauer in Handbook of Preparative Inorganic Chemistry, vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) p 1016. 

Sulflds.—Cuprous Sulfld—or protosuJfid of copper— CusS—158.4—occurs in nature as copper glance or chalcosine, and in many double sulflds, pyrites. 

Chalcocite Copper glance CUjS black or dark lead-gray An important ore of copper. Common in the zone of secondary enrichment... 

Cuprite (red) Malachite (green) Azurite (blue) Copper glance (e) Copper pyrite.s... 

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