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chalcopyrite with rainbow colors

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How does chalcopyrite get rainbow colors, in my mining career I've found quite a few raw copper rocks that are crystalized in rainbow colors

asked Oct 8, 2014 by Malpais1 (120 points)

1 Answer

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The colors are caused by iridescence, which is similar to tarnishing when the chalcopyrite is exposed to weathering or acid.

answered Oct 13, 2014 by hershel (51,320 points)