A type of calcium-rich clinopyroxene, it is the most common colored mineral in igneous rocks. It is also called augite. Its main chemical composition is (Ca, Mg, Fe 2+ ) 2 Si 2 O 6 , with small amounts of Al, Fe 3+ , Ti, etc. When the Ca/(Ca + Mg + Fe 2+ ) ratio is 45-25%, it is called augite, when it is 25-15%, it is called subcalcic augite, and when the Mg/Fe ratio is less than 1, it is called ferroaugite and subcalcic ferroaugite. When it contains about 3-5% TiO 2 , it is called titanium augite. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
Caに富む単斜輝石の一種で火成岩のもっとも普通な有色鉱物。〈普通輝石〉ともいう。主要化学組成は(Ca,Mg,Fe2+)2Si2O6で,少量のAl,Fe3+,Tiなどを含む。Ca/(Ca+Mg+Fe2+)が45~25%のものをオージャイト,25~15%のものをサブカルシックオージャイト,Mg/Feが1より小さいものはフェロオージャイトおよびサブカルシックフェロオージャイトとよぶ。TiO2を約3~5%含むものはチタンオージャイトという。
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