Mineral: Chalcocite
Locality: Bristol Copper Mine, Bristol, Hartford County, Connecticut, USA
Dimensions: 12,0 x 12,0 x 11,0 cm

Description: Main crystal size: 4,0 cm Semi-floating group of black, sharp-edged twinned crystals MIM number 1013 Photographer: Augustin de Valence (Aïnu) Publication: "Rocks & Minerals: Vol. 98, No.6 Nov/Dec 2023"

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