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Chalcocite: Cu2S
Comments: Chalcocite crystals in this specimen vary in size up to 1.2 cm across. Location: Bristol nr. Hartford, Connecticut, USA. Scale: 7.6 x 4 cm. © John Veevaert
Chalcocite: Cu2S Eskolaite: Cr2O3
Comments: Green crystalline eskolaite on massive chalcocite. Location: Lubelin, Poland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species