rhamphotheca: An artificially grown bismuth crystal, illustrating the stairstep crystal structure, with a 1-cm cube of bismuth metal for comparison. The iridescent surface here is a very thin layer of oxidation. Photo: Heinrich Pniok

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rhamphotheca: An artificially grown bismuth crystal, illustrating the stairstep crystal structure, with a 1-cm cube of bismuth metal for comparison. The iridescent surface here is a very thin layer of oxidation. Photo: Heinrich Pniok

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