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RM1400   Bornite on pyrite

Milpillas Mine, Cuitaca, Mun. de Santa Cruz, Sonora, Mexico

Everybody knows about Milpillas secondary copper minerals, but this locality is not well-known by the complex pyrite crystals coated by bornite. We propose one of the few specimens I have seen. In this sample we can see the dominant forms of the cube, but also the octahedron, surrounded by trapezohedron and possibly the dodecahedron on edges. Bright and well disposed in a solid matrix. It is a true crystallographic gem.

Size: 8.0 x 6.5 x 5.7 cm.
Main crystal: 18 x 18 mm.