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Iridescence
Light effect causing a mineral to display a play of colors on an apparently monocolored surface. Iridescence is often the result of pearly luster, seen around an area where pressure occurred (displaying a similar image to that of fresh oil rising to the surface of a road at the beginning of a rain.) Iridescence is also the result of mild tarnishing of a few metallic lustered minerals such as Chalcopyrite.
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