A type of phosphorus-containing mineral. It is widely distributed and is rich in chlorine. Its chemical composition is Ca 5 (PO 4 ) 3 Cl, but some of the Cl is often replaced by F, CO 3 , or OH. It occurs as hexagonal, columnar crystals or hexagonal thick plate-like crystals, but often exists as a mass aggregate. It is colorless, white, light green, light brown, gray, or has a vitreous luster. Its Mohs hardness is 5, and its specific gravity is about 3. It often occurs as veins in basic plutonic rocks, as well as in contact with igneous rocks, deposits in the same geological zone, and voids in hydrothermal deposits. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
含リン鉱物の一種。広く分布し,塩素に富む鉱物。化学組成はCa5(PO4)3ClであるがClの一部がF,CO3,OHで置換されていることが多い。六方晶系,柱状結晶または六角厚板状の結晶として産出するが,塊状集合体として存在することが多い。無色,白色,淡緑色,淡褐色,灰色,ガラス光沢を呈する。モース硬度5,比重約3。塩基性深成岩類中に脈状を呈して産出することが多く,その他火成岩接触部や同種の地質帯の鉱床,熱水鉱床内の空隙などに産出する。
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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