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Hornblende is a complex inosilicate series of minerals (ferrohornblende – magnesiohornblende).〔http://www.mindat.org/min-8789.html Mindat〕 It is not a recognized mineral in its own right, but the name is used as a general or field term, to refer to a dark amphibole. Hornblende is an isomorphous mixture of three molecules; a calcium-iron-magnesium silicate, an aluminium-iron-magnesium silicate, and an iron-magnesium silicate. The general formula can be given as (Ca,Na)2–3(Mg,Fe,Al)5(Al,Si)8O22(OH,F)2. == Compositional variances == Some metals vary in their occurrence and magnitude: * Manganese and titanium are often present. * Sodium and potassium are often present and fluorine often substitutes for the hydroxyl in the crystalline structure. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「hornblende」の詳細全文を読む スポンサード リンク
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