Chalcocite

Chalcocite is a dark gray to black copper sulfide mineral with a metallic luster and high copper content. Found in regions like Cornwall, England, and the southwestern United States, it's a significant copper ore. Chalcocite has a hardness of 2.5 to 3 on the Mohs scale and exhibits a brittle fracture. Its unique properties and rich, metallic appearance make it a prized specimen for mineral collectors. This gemstone's primary use is in the extraction of copper, making it both an industrial and collectible mineral.

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