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,...
Found on http://en.wikipedia.org/wiki/Halotrichite

Halotrichite

• (n.) An iron alum occurring in silky fibrous aggregates of a yellowish white color.
Found on http://thinkexist.com/dictionary/meaning/halotrichite/

Halotrichite

Hal·o·tri'chite (hăl*o*trī'kīt) noun [ Greek 'a`ls sea + qri`x , tricho`s , hair.] (Min.) An iron alum occurring in silky fibrous aggregates of a yellowish white color.
Found on http://www.encyclo.co.uk/webster/H/8

halotrichite

a sulfate mineral containing aluminum and iron [FeAl2(SO4)422H2O]. If more than 50 percent of the iron has been replaced by magnesium, the mineral ...
Found on http://www.britannica.com/eb/a-z/h/8
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