Halotrichite
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...However, it is not clear whether there are actually minerals with 24 waters of crystallization. For example, halotrichite Fe II SO 4 ･Al 2 (SO 4 ) 3 ･22H 2 O is a monoclinic mineral that is formed when hydrothermal solutions containing sulfuric acid act on igneous rocks. Pickeringite MgSO 4 ･Al 2 (SO 4 ) 3 ･22H 2 O is also a monoclinic mineral that is found when rocks are attacked by sulfuric acid. From [Alum]...Light purple octahedral crystals. There is a monoclinic crystal called iron alum that is found 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. ... *Some of the terminology explanations that mention "halotrichite" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…しかし実際には結晶水が24のものが存在するかどうかは明確でない。たとえば鉄ミョウバン(halotrichite)FeIISO4･Al2(SO4)3･22H2Oは，硫酸を含む熱水溶液が火成岩に作用して生ずる単斜晶系の鉱物である。また苦土ミョウバン(pickeringite)MgSO4･Al2(SO4)3･22H2Oは単斜晶系の鉱物で，やはり岩石が硫酸に侵された場合にみられる。… 【ミョウバン(明礬)】より…淡紫色八面体結晶。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。… ※「halotrichite」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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