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Tetrahedrite: (Cu,Fe)12Sb4S13
Comments: Bright sharp metallic tetrahedrite crystals to 1 cm in size on pinkish to colorless crystalline calcite matrix. Location: Cavnic (Kapnik), Maramures, Romania. Scale: 14 x 11 x 3 cm. © Dan Weinrich
Comments: A very brilliant tetrahedrite group with the tops of the crystals covered in chalcopyrite. Location: Casapalca, Lima, Peru. Scale: 8 x 6 cm. © Fabre Minerals