云母的命名

Nomenclature of the Micas

定义云母为层状硅酸盐。其结构单元由两个相向排列的四面体片（Ｔｓ）和夹于其间的一个八面体片（Ｏｓ）组成。这些片构成一个单元层，层与层之间被非水化层间阳离子（Ｉ）分开，其顺序是：非水化阳离子层、四面体片、八面体片、四面体片、非水化阳离子层、四面体片、八面...

End members and species defined with permissible ranges of composition are presented for the true micas,the brittle micas,and the interlayer cation deficient micas.The determination of the crystallochemical formula for different available chemical data is outlined,and a system of modifiers and suffixes is given to allow the expression of unusual chemical substitutions or polytypic stacking arrangements.Tables of mica synonyms,varieties,ill defined materials,and a list of names formerly or erroneously used for micas are presented. The Mica Subcommittee was appointed by the Commission of New Minerals and Mineral Names of the International Mineralogical Association. The definitions and recommendations presented were approved by the Commission.