A type of mineral. Also called anorthite. Plagioclase forms solid solutions, and anorthite is the Ca end member of these. Its chemical composition is CaSi 2 Al 2 O 8 , but it contains less than 10 mol% NaSi 3 AlO 8. It has a triclinic crystal system, mainly forming plate-like or columnar crystals with developed {010} faces, and cleavage is {001} or {010}. It has a glassy luster and is colorless, but when altered, it turns white or gray. Its Mohs hardness is 6 to 6.5, and its specific gravity is 2.75 to 2.77. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
鉱物の一種。灰長石ともいう。斜長石は固溶体を形成するが,アノーサイトはこのうちのCa端成分をいう。化学組成はCaSi2Al2O8であるが,NaSi3AlO8成分を10mol%以下含む。結晶系は三斜晶系で,おもに{010}面の発達した板状結晶または柱状結晶をなし,へき開は{001}や{010}である。ガラス状光沢をなし,色は無色であるが,変質を受けると白色や灰色になる。モース硬度は6~6.5で,比重は2.75~2.77である。
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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