Mineral: Silver with Copper
Locality: Quincy Mine, Hancock, Houghton County, Michigan, USA
Dimensions: 11,0 x 5,0 x 9,0 cm

Description: Main crystal size: 2,7 cm Elongate, sharp-edged, tetrahexahedral twinned crystals on a matrix of oxidized copper MIM number 1071 Photographer: Augustin de Valence (Aïnu)

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