Mineral: Ferberite
Locality: Tazna Mine (Tazna-Rosario Mine), Cerro Tazna, Atocha-Quechisla District, Nor Chichas Province, Potosí Department, Bolivia
Dimensions: 10,0 x 8,5 x 7,0 cm

Description: Main crystal size : 10,2 cm Perfect black twin in the shape of a sharp-edged butterfly MIM number 719 Photographer : Augustin de Valence (Ainu)

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