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play of color

A pseudochromatic optical effect resulting in flashes of colored light from certain minerals, such as fire opal and labradorite, as they are turned in white light. Periodic spacings of phases with slightly differing refractive indices act as optical diffraction gratings in these minerals. Compare: fire; opalescence; pseudochromatism.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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