Definition:a black,dark brown,or greenish black micaceous mineral,occurring as aconstituent of many igneous and metamorphic rocks黑云母hēi yún mǔFormula:K (Mg,Fe)3〔AlSi3O10〕(OH,F)2Origin:mid 19th century:named after J.-B. Biot(1774-1862),French mineralogistE......(本文共 630 字) [閱讀本文] >>


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