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Unknown metallic rock.

I submitted a couple of photos of a rock I had recently found. After I cut it I was a bit surprised to find that it is metallic in nature. Not sure just what type of metal it is. Gold is not an option here. The exterior seems tarnished, thinking maybe chalcopyrite. If you have any suggestions as to what it may be I'd love to them. When I was grinding and polishing there seemed to be a lot of black showing up in the water. On the prepolish pads it left a black film on the material. I'm sure it will eventually disappear.

From Ward - February 22, 2012 at 00:05:28

Message: 70220



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