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Chalcocite ( UK : / ˈ k æ l k ə ˌ s aɪ t / [5] ), copper(I) sulfide (Cu 2 S), is an important copper ore mineral. It is opaque and dark-gray to black with a metallic luster . It has a hardness of ​ 2   1 ⁄ 2 - 3 on the Mohs scale . It is a sulfide with an orthorhombic crystal system.