…Amphibole is generally divided into three groups according to what is included in the X in the chemical composition: (1) the anthocene-cummingtonite group, in which X contains Mg and Fe and contains very little Ca, (2) the calcium anthocene group, in which X contains Ca, and (3) the alkaline anthocene group, in which X contains Na. Anthocene and cummingtonite belong to (1). … *Some of the terminology that refers to "alkali amphibole" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…角セン石は一般に化学組成のXに何が入るかによって次の三つのグループに分けられる。(1)XにMgとFeが入り,Caをほとんど含まない直セン石‐カミングトンセン石グループ,(2)XにCaが入るカルシウム角セン石グループ,(3)XにNaが入るアルカリ角セン石グループ。(1)には直セン石やカミングトンセン石などが属している。… ※「アルカリ角セン石」について言及している用語解説の一部を掲載しています。 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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