Bornite over Pyrite
Milpillas Mine, Mexico
Milpillas Mine, Cuitaca, Mun. de Santa Cruz, Sonora, Mexico
A wonderful thumbnail crystal of pyrite coated with bornite from the Milpillas Mine in Sonora, Mexico! This well formed pyrite crystal is coated with a thin layer of irridescent bornite. The crystal sits on a very small piece of white matrix, adding to the contrast of colors. Bornite has been confirmed by analysis done at the University of Arizona.