2005/06/15 | 猫眼石[Opal]
类别(℃〖化学〗) | 评论(0) | 阅读(21) | 发表于 20:04
The mineral SiO2H2O. Gem opal consists of a collection of spheres arranged in parallel planes. These planes serve as diffraction gratings, resulting in the spectacular opalescence.
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