{{Infobox mineral | name = Haidingerite | boxwidth = | boxbgcolor = | image = Haidingerite.jpg | imagesize = | alt = | caption = White crystals of haidingerite associated with yellow orpiment and red realgar from the White Caps Mine, Manhattan District, Nevada, United States. | struct image = | struct caption = | struct imagesize = | struct2 image = | struct2 caption = | struct2 imagesize= | SMILES = | Jmol = | category = | formula = Ca(AsO<sub>3</sub>OH)·H<sub>2</sub>O | IMAsymbol = | molweight = | strunz = | dana = | system = | class = | symmetry = | unit cell = | color = | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | toughness = | mohs = 2 – 2.5 | luster = | streak = | diaphaneity = | gravity = 2.95 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }} '''Haidingerite''' is a calcium arsenate mineral with formula Ca(AsO<sub>3</sub>OH)·H<sub>2</sub>O. It crystallizes in the orthorhombic crystal system as short prismatic to equant crystals. It typically occurs as scaly, botryoidal or fibrous coatings.<ref name=Handbook>http://rruff.geo.arizona.edu/doclib/hom/haidingerite.pdf Mineral Data Publishing, ''Handbook of Mineralogy''</ref> 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.<ref name=Mindat>http://www.mindat.org/min-1797.html Mindat with location data</ref>
It was originally discovered in 1827 in Jáchymov, Czech Republic. It was named to honor Austrian mineralogist Wilhelm Karl Ritter von Haidinger (1795–1871).<ref name=Webmin>http://www.webmineral.com/data/Haidingerite.shtml Webmineral data</ref> It occurs as a dehydration product of pharmacolite in the Getchell Mine, Nevada.<ref name=Handbook/>
==See also== * List of minerals named after people
==References== {{Reflist}} * Palache, C., H. Berman, and C. Frondel (1951) ''Dana’s system of mineralogy'', (7th edition), v. II, pp.708–709.
Category:Calcium minerals Category:Arsenate minerals Category:Orthorhombic minerals Category:Minerals in space group 60
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