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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.[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]


  1. ^ a b http://rruff.geo.arizona.edu/doclib/hom/haidingerite.pdf Mineral Data Publishing, Handbook of Mineralogy
  2. ^ http://www.mindat.org/min-1797.html Mindat with location data
  3. ^ 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.