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Tourmaline

Revision as of 13:04, 8 February 2006 by Yslee (talk | contribs)
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Na, B, F 를 함유한 알루미나규삼인데 여기에 Mg,Fe, Mn, Li 등을 함유 할 때에는 마그네슘전기석 이라고도 한다.