Bornite stands out for the amazing metallic blue-green color it turns after exposure to the air. That gives bornite the nickname peacock ore. Bornite has a Mohs hardness of 3 and a dark gray streak.
Copper sulfides are a closely related mineral group, and they often occur together. In this bornite specimen are also 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.