Also called Kaersut amphibole. A type of calcium amphibole, its chemical composition is Ca2 (Na,K)(Mg,Fe2 + , Fe3 + ) 4TiAl2Si6O22 (OH) 2 . It has a similar chemical composition to basalt hornblende. Among calcium amphibole, it contains a characteristically large amount of Ti. Most of them usually contain 5-10% TiO2 by weight. Na and K, Mg, Fe2 + and Fe3 + are mixed in various ratios. When the Mg/(Mg+Fe2 + ) ratio is 0-0.49, it is called ferrokaersutite. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ケルスート角セン石ともいう。カルシウム角セン石の一つで,化学組成はCa2(Na,K)(Mg,Fe2+,Fe3+)4TiAl2Si6O22(OH)2で表される鉱物。玄武ホルンブレンドとよく似た化学組成をもつ。カルシウム角セン石の中で特徴的にTiを多く含んでいる。ふつうはTiO2が5~10重量%のものが多い。NaとK,MgとFe2+とFe3+はさまざまな比で混ざりあう。Mg/(Mg+Fe2+)が0~0.49のものを鉄ケルスートセン石ferrokaersutiteと呼ぶ。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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