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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. 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. It was originally discovered in 1827 in Jáchymov, Czech Republic. It occurs as a dehydration product of pharmacolite in the Getchell mine, Nevada.


  • Palache, C., H. Berman, and C. Frondel (1951) Dana’s system of mineralogy, (7th edition), v. II, pp.708–709.
  • Mindat with location data
  • Webmineral data
  • Mineral Data Publishing - PDF
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Haidingerite". A list of authors is available in Wikipedia.
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