Also called tremolasite or tremola. A calcium amphibole mineral with the chemical composition Ca 2 Mg 5 Si 8 O 22 (OH) 2. Contains a small amount of Fe. It has the same chemical composition as actinocene, but tremolasite has an Mg/(Mg+Fe 2+ ) ratio of 0.9 to 1.0. Monoclinic crystal system. Specific gravity 3.0, Mohs hardness 5 to 6. It occurs as white to gray-white columnar to asbestos-like aggregates. It appears in large quantities in dolomitic limestone that has undergone low-temperature metamorphism. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
透角セン石,トレモラ(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Ca2Mg5Si8O22(OH)2で表される鉱物。Feを少量含んでいる。アクチノセン石と化学組成は同じであるが,Mg/(Mg+Fe2+)が0.9~1.0のものを透セン石と呼ぶ。単斜晶系。比重3.0,モース硬度5~6。白色~灰白色の柱状~アスベスト状の集合体として産する。低温変成作用をうけたドロマイト質の石灰岩には多量に出現する。
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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