Mineral Information and Data:

Brassite
Mg(AsO3OH) • 4H2O [CNMNC approved formula]

Named Honoring Rejane Brasse, who first synthesized the compound.

IMA status : Approved Species 1973 ()
CLASSIFICATION 
Dana
(8th edition) :
39.01.07.01  
  (39) Hydrated Acid Phosphates
  (39.01) A+ [HXO4] · x(H2O)
  (39.01.07)
  
Nickel-Strunz
(10th edition) :
08.CE.15
  (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: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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