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Haidingerite : ウィキペディア英語版 | Haidingerite Haidingerite is a calcium arsenate mineral with formula Ca(AsO3OH)·H2O. It crystallizes in the orthorhombic crystal system as short prismatic to equant crystals. It typically occurs as scaly, botryoidal or fibrous coatings.〔http://rruff.geo.arizona.edu/doclib/hom/haidingerite.pdf Mineral Data Publishing, ''Handbook of Mineralogy''〕 It is soft, Mohs hardness of 2 to 2.5, and has a specific gravity of 2.95. It has refractive indices of nα = 1.590, nβ = 1.602 and nγ = 1.638.〔http://www.mindat.org/min-1797.html Mindat with location data〕 It was originally discovered in 1827 in Jáchymov, Czech Republic. It was named to honor Austrian mineralogist Wilhelm Karl Ritter von Haidinger (1795–1871).〔http://www.webmineral.com/data/Haidingerite.shtml Webmineral data〕 It occurs as a dehydration product of pharmacolite in the Getchell Mine, Nevada.〔 ==References==
* Palache, C., H. Berman, and C. Frondel (1951) ''Dana’s system of mineralogy'', (7th edition), v. II, pp.708–709.
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