A general term for silicate minerals whose basic building blocks are SiO4 tetrahedra, in which Al replaces a significant amount of the Si at the tetrahedral positions. Examples include feldspar, mica, zeolite, and clay minerals. Feldspar minerals, which are representative of this group, are important rock-forming minerals that are composed mainly of O, Si, and Al, the most abundant elements in the earth's crust, and are said to account for about 60% of the earth's crust volume. In silicate minerals, there is a tendency for the Al/Si ratio to increase as the degree of polymerization of SiO4 tetrahedra increases. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
SiO4四面体を基本構成単位とするケイ酸塩鉱物のうち,四面体位置のSiの相当量をAlが置換している鉱物の総称。長石,雲母,沸石,粘土鉱物などが該当する。地殻中に最も豊富に存在する元素のO,Si,Alを主成分とし,その代表格である長石族鉱物は,地殻体積の約60%を占めるといわれる重要な造岩鉱物である。ケイ酸塩鉱物ではSiO4四面体の重合度が増すにつれAl/Si比が大きいものが出現するという傾向がある。
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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