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Chalcostibite: CuSbS2
Comments: Partial crystal of chalcostibite. The crystal is partially altered to blue azurite and green malachite. Location: Gar El Anz, Morocco. Scale: 3 x 1.8 cm. © John Veevaert
Comments: Dark gray crystals of chalcostibite on white quartz matrix. Location: Boldut mine, Cavnic Maramures, Rumania. Scale: 7 x 7 x 3.5 cm. © Fabre Minerals