Mineral Information and Data:

Guerinite
Ca5(AsO3OH)2(AsO4)2 • 9H2O [CNMNC approved formula]

Named for H. Guerin.

IMA status : Valid species (Pre-IMA 1961) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
39.02.02.02  
  (39) Hydrated Acid Phosphates
  (39.02) H2 (AB)5 (XO4)4 · x(H2O)
  (39.02.02)
  
Nickel-Strunz
(10th edition) :
08.CJ.75
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CJ) With only large cations
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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