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Posted in response to Chalcopyrite Treatment from Andrew on May 19, 2007 at 19:36:13:

Re: Chalcopyrite Treatment

I assume you are referring to the irridescent colors that can develop on chalcopyrite. They are natural and result from a thin film of (I believe) copper oxide. If the film is thin, there is interference of reflected light from the upper and lower surfaces. The color one sees is related to the thickness of the film. It is the same phenomenon as the colors of an oil slick floating on water.

From Don Peck - May 20, 2007 at 10:53:38
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