...It has a specific gravity of 1.97, is highly soluble in water, and is more astringent than alum. Kalinite, a mineral very similar to alum and also called natural alum, is considered to be different from alum because it is fibrous and optically biaxial, and is thought to have the composition KAl(SO 4 ) 2 ・11H 2 O. It is often found as a volcanic sublimate, but can also be formed by the transformation of feldspars due to sulfuric acid produced by the oxidation of pyrite. *Some of the terminology that mentions "kalinite" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…比重1.97,水によく溶け,ミョウバンより収れん性が強い。ミョウバンによく似た鉱物で,自然ミョウバンとも呼ばれるカリナイトkaliniteは,形態が繊維状で光学的に二軸性があることからミョウバンとは違うものとされ,KAl(SO4)2・11H2Oの組成をもつものと考えられている。火山の昇華物として産することが多いが,黄鉄鉱の酸化で生じた硫酸のため,長石類が変成して生成することもある。… ※「kalinite」について言及している用語解説の一部を掲載しています。 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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