...There is a monoclinic crystal called iron alum that occurs in alum springs, but this is a mineral called halotrichite, which is Fe II SO 4 ・Al 2 (SO 4 ) 3 ・22H 2 O and is not alum. (a) Potassium iron alum KFe(SO 4 ) 2 ・12H 2 O Specific gravity 1.8. Dissolves in water of crystallization at 83°C. ... *Some of the terminology that mentions "potassium iron alum" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ミョウバン泉などに産する鉄ミョウバンと呼ばれる単斜晶系結晶があるが,これはハロトリ石halotrichiteという鉱物で,FeIISO4・Al2(SO4)3・22H2Oであってミョウバンではない。(a)カリウム鉄ミョウバンKFe(SO4)2・12H2O 比重1.8。83℃で結晶水に溶ける。… ※「カリウム鉄ミョウバン」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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