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    Halotrichite, also known as feather alum, is a highly hydrated sulfate of aluminium and iron. It is formed by the weathering and decomposition of pyrite commonly near or in volcanic vents. Its chemical formula is FeAl2(SO4)422H2O. It forms fibrous monoclinic crystals. The crystals are water soluble. Occurrences include the Atacama Desert, Chile, Dresden, Saxony, Germany, San Juan County, Utah, and Mont Saint-Hilaire, Canada.

The name is from Latin: halotrichum for salt hair.


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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Halotrichite". A list of authors is available in Wikipedia.
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