yes, a geo's about! No round or smooth edges, so it is probably not from drill core.
Hard to make out the dull yellow mineral in the upper left. Probably pyrite (FeS2) or chalcopyrite (CuFeS2). Chalcopyrite is copper ore, pyrite is rubbish.
Iridescent purple-blue is bornite (Cu5FeS4). It looks like it is a thin film on the dull yellow mineral, so the underlying mineral is probably chalopyrite - pyrite would not hold enough Cu to form bornite.
Chalcocite (Cu2S) is a secondary mineral and usually a gray, black or green colour.
G
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yes, a geo's about! No round or smooth edges, so it is probably...
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