8-231f06-th.jpg
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8-231f06-th.jpg
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An irridescent synthetic bismuth crystal.
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A synthetic bismuth crystal. The bottom front edge has a length of about 3.5cm. The irridescent color is created due to interference effects in a thin oxide layer, which forms when the hot crystal is pulled out of the bismuth melt. (Image courtesy of Wikipedia user Dschwen.)
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