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RM1400   Bornite on pyrite

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

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.


RM814   Malachite after azurite

Milpillas mine, Cuitaca, Santa Cruz, Sonora, México

Very aesthetic group of aerial malachite crystals pseudomorphic after azurite showing a tabular shape with rounded faces. Color is deep green with a very well marked velvet luster. Good specimen from Milpillas.

Size: 5,5 x 4,3 x 4,0 cm.
Main crystal: 3,7 x 2,6 cm.