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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