Mineral Information and Data:

Haidingerite
Ca(AsO3OH) • H2O [CNMNC approved formula]

Named Name for William Karl von Haidinger (1795-1871), Austrain mineralogist and geologist.

IMA status : Valid species (Pre-IMA 1827) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
39.01.05.01  
  (39) Hydrated Acid Phosphates
  (39.01) A+ [HXO4] · x(H2O)
  (39.01.05)
  
Nickel-Strunz
(10th edition) :
08.CJ.20
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CJ) With only large cations
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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