Mineral Information and Data:

Haigerachite
KFe3+3(H2PO4)6(HPO4)2 • 4H2O [CNMNC approved formula]

Named for the village and valley near the locality: Silberbrunnle mine dump near Gengenbach in the central Black Forest, Aufschluss, Germany.

IMA status : Approved Species 1999 ()
CLASSIFICATION 
Dana
(8th edition) :
39.03.10.01  (This Dana# Added)
  (39) Hydrated Acid Phosphates
  (39.03) with miscellaneous formulae
  (39.03.10)
  
Nickel-Strunz
(10th edition) :
08.CF.10
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CF) With large and medium-sized cations, RO4:H2O > 1:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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