Haidingerite

White crystals of haidingerite associated with yellow orpiment and red realgar from the White Caps Mine, Manhattan District, Nevada, United States.

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.^[1] 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.^[2]

It was originally discovered in 1827 in Jáchymov, Czech Republic. It was named to honor Austrian mineralogist Wilhelm Karl Ritter von Haidinger (1795–1871).^[3] It occurs as a dehydration product of pharmacolite in the Getchell Mine, Nevada.^[1]

References[]

^ ^a ^b http://rruff.geo.arizona.edu/doclib/hom/haidingerite.pdf Mineral Data Publishing, Handbook of Mineralogy
^ http://www.mindat.org/min-1797.html Mindat with location data
^ http://www.webmineral.com/data/Haidingerite.shtml Webmineral data

Palache, C., H. Berman, and C. Frondel (1951) Dana’s system of mineralogy, (7th edition), v. II, pp.708–709.

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[Handbook-1] ttp://rruff.geo.arizona.edu/doclib/hom/haidingerite.pdf Mineral Data Publishing, Handbook of Mineralogy

[Mindat-2] ttp://www.mindat.org/min-1797.html Mindat with location data

[Webmin-3] ttp://www.webmineral.com/data/Haidingerite.shtml Webmineral data

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