Mineral: Copper
Locality: Quincy Mine, Hancock, Houghton County, Michigan, USA
Dimensions: 16,0 x 8,0 x 2,5 cm
Description: Main crystal size: 5,5 cm
Sharp-edged tetrahexahedral and dodecahedral crystals, with a coating of black cryptocrystalline tenorite and dark red cuprite on some parts
MIM number 1096
Photographer: Augustin de Valence (Aïnu)
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