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- 19:36, 27 June 2026 Cornish semiconductor talk contribs created page Chalcocite (Created page with "right|frame|A curve trace of calcocite from Penstruthal mine * Lustre:Metallic, Sub-Metallic * Transparency:Opaque * Colour:Blue black, gray, black, black gray, or steel gray * Streak:Blackish lead gray * Hardness:2½ - 3 on Mohs scale * Tenacity:Brittle * Cleavage:Poor/Indistinct Indistinct on (110) * Fracture:Conchoidal * Comment:Somewhat sectile [https://www.mindat.org/min-955.html Data from mindat.org] Chalcocite is also called...")
