A general term for a group of hydrous silicate minerals that contain Ca, Mg, Fe, Al, Na, K, etc. in various proportions. The group of minerals that belong to the amphibole group is called the amphibole group. Along with pyroxenes, amphibole is one of the minerals with the widest range of change in chemical composition. In general, the chemical composition of the amphibole group is expressed as W 0-1 X 2 Y 5 Z 8 O 22 (OH) 2. W represents Na and K, X represents metal ions such as Na, Ca, Mg, Fe 2+ , and Mn 2+ , Y represents ions such as Mg, Fe 2+ , Fe 3+ , Al, and Ti, and Z represents Si, Al, and Ti ions. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
CaやMg,FeおよびAlやNa,Kなどをさまざまな割合で含む一群の含水ケイ酸塩鉱物の総称。角セン石に属する鉱物群を角セン石族と呼ぶ。角セン石は輝石とともに化学組成の変化する範囲が最も広い鉱物の一つである。一般に角セン石族の化学組成はW0~1X2Y5Z8O22(OH)2と表される。WにはNaとKが,XにはNa,CaやMg,Fe2+,Mn2+などの金属イオンが,YにはMg,Fe2+,Fe3+,Al,Tiなどのイオンが,ZにはSi,Al,Tiイオンが入る。
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