出典:Wiktionary
出典:『Wiktionary』 (2025/04/20 19:32 UTC 版)
-ite
halotrichite (countable and uncountable, plural halotrichites)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/14 12:44 UTC 版)
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.