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precious opal

A gem variety of opal that exhibits a brilliant play of delicate colors by diffraction of light from close-packed 150- to 300-mm spheres of cristobalite-tridymite. The color of the bulk material may be black or white. Compare: common opal.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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