Bornite
Written by Boss Tambang Wednesday, 02 December 2009 00:09
Bornite (Cu5FeS4)is one of the lesser copper ore minerals, mostly copper and sulfur with a little iron. What makes it stand out is the amazing metallic blue-green color it turns after exposure to the air. That gives it the nickname peacock ore. Copper sulfides are a closely related mineral group, and they often occur together. In this specimen are bits of golden metallic chalcopyrite (CuFeS2) and areas of dark-gray chalcocite (Cu2S). The white matrix is calcite. I’m guessing that the green, mealy-looking mineral is sphalerite (ZnS), but don’t quote me.
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