Mineral Information and Data:

Manganohornesite
Mn2+3(AsO4)2 • 8H2O [CNMNC approved formula]

Named for the composition and relationship to hornesite.

IMA status : Valid species (Pre-IMA 1951) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
40.03.07.02  
  (40) Hydrated Phosphates
  (40.03) where (A++)3 (XO4)2 · x(H2O)
  (40.03.07)
  
Nickel-Strunz
(10th edition) :
08.CE.40
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CE) With only medium-sized cations, RO4:H2O about 1:2.5
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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