A type of mineral. Its chemical composition is Ca 3 (PO 4 ) 2 , but usually some of the Ca 2+ is replaced by small amounts of Mn 2+ , Fe 2+ , Mg 2+ , etc., and some of the PO 4 3- is replaced by small amounts of CO 3 2- . It belongs to the hexagonal crystal system and sometimes forms plate-like crystals, but can also form granular aggregates or soil-like structures. It is colorless, white, or gray, with a Mohs hardness of 5 and a specific gravity of 3.15. It has been reported that it occurs in pegmatites accompanied by phosphate minerals such as quartz, siderite, and apatite as end products, and that it occurs in phosphate rocks. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
鉱物の一種。化学組成はCa3(PO4)2であるが,通常Ca2+の一部を少量のMn2+,Fe2+,Mg2+などで,またPO43-の一部を少量のCO32-により置換している。六方晶系に属し,ときには板状の結晶となるが,粒状集合体,土壌状を示す場合もある。無色,白色,灰色を呈し,モース硬度5,比重3.15。ペグマタイト中にその末期生成物として石英,リョウ鉄鉱およびリン灰石などのリン酸塩鉱物を伴って産出する場合や,リン酸塩岩石中に存在する場合などが報告されている。
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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