Mineral Information and Data:

Villyaellenite
(Mn,Ca)Mn2+2Ca2(AsO4)2(AsO3OH)2 • 4H2O [CNMNC approved formula]

Named for Villy Aellen, director of the Natural History Museum of Geneva, Switzerland.

IMA status : Approved Species 1984 ()
CLASSIFICATION 
Dana
(8th edition) :
39.02.01.03  
  (39) Hydrated Acid Phosphates
  (39.02) H2 (AB)5 (XO4)4 · x(H2O)
  (39.02.01) Hureaulite Group
  
Nickel-Strunz
(10th edition) :
08.CB.10
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CB) With only medium-sized cations, RO4:H2O = 1:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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