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halotrichite : ウィキペディア英語版 | halotrichite
Halotrichite, also known as ''feather alum'', is a highly hydrated sulfate of aluminium and iron. Its chemical formula is FeAl2(SO4)4·22H2O. It forms fibrous monoclinic crystals. The crystals are water-soluble. It is formed by the weathering and decomposition of pyrite commonly near or in volcanic vents. Occurrences include the Atacama Desert, Chile, Dresden, Saxony, Germany, San Juan County, Utah, Iceland, and Mont Saint-Hilaire, Canada. The name is from Latin: ''halotrichum'' for salt hair.〔 ==References==
*(Saint-Hilaire ) *(Mineral Atlas )
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