Halotrichite

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A sample of Halotrichite

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)₄⋅22H₂O. 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.

[edit] References

• Webmineral
• Saint-Hilaire
• Mineral Atlas

This article about a specific mineral, mineraloid, or rock type is a stub. You can help Wikipedia by expanding it.

Retrieved from "http://en.wikipedia.org../../../h/a/l/Halotrichite.html"

Categories: Iron minerals | Aluminium minerals | Sulfate minerals | Mineral stubs

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• This page was last modified 00:58, 11 October 2006 by Wikipedia user GreatMizuti. Based on work by Wikipedia user(s) YurikBot, GeeJo, Jaraalbe, Vsmith, Xgoni, Jonnabuz and Ping and Anonymous user(s) of Wikipedia.
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