オパール
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Japanese
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/30/Opal_banded.jpg/220px-Opal_banded.jpg)
Etymology
[edit]Noun
[edit]- (mineralogy) opal, a mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity
References
[edit]- ^ Matsumura, Akira (1995) 大辞泉 [Daijisen] (in Japanese), First edition, Tokyo: Shogakukan, →ISBN