A mineral in which a metal element is bonded with a hydroxyl group -OH, and there are relatively few mineral species. When electropositive metals such as Mg and Al are bonded with two and three hydroxyl groups, respectively, Mg(OH) 2 and Al(OH) 3 are formed. The former is brucite, and the latter is gibbsite. Both minerals form in moist environments. Brucite is a mineral formed as a result of hydration caused by weathering decomposition of high magnesium-containing rocks such as serpentine and low-temperature hydrothermal alteration, while gibbsite is a mineral formed as a result of hydration caused by weathering decomposition of acidic rocks and is the main component of bauxite. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
金属元素と水酸基-OHの結合した鉱物で,鉱物種としては比較的少数である。陽性成分である金属,例えばMg,Alとそれぞれ水酸基が2個および3個結合し,Mg(OH)2とAl(OH)3が生成する。前者はブルーサイト,後者はギブサイトである。それぞれ水分の多い環境において生成する鉱物であって,ブルーサイトは高マグネシウム含有岩石の蛇紋岩などの風化分解,低温の熱水変質などにより加水された結果生成した鉱物であり,ギブサイトは酸性岩の風化分解作用による加水の結果生じた鉱物であってボーキサイトの主成分鉱物である。
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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