This is a copper ore rock that was given to me when I did visit the now defunct Aur Louvicourt Copper Mine near Val-d'Or, QC, about 10 years ago. It was taken at a deep of about 1200 meters.
The rock contains mostly copper but it also contains iron, nickel, zinc, and possibly gold (as the mine was also producing gold).
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Alain - Very well photographed piece of copper ore. These types of rocks are extremely hard to photograph well, show detail, and make interesting. I think you did a fine job with it.
Another photo of a rock... You achieved a nice light cast on this but it is still just a rock and does not make for a very interesting shot with any amount of photographic value.