オパール
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Japanese[edit]
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 (in Japanese), First edition, Tōkyō: Shogakukan, →ISBN