Mineral Information and Data:

Brandtite
Ca2Mn2+(AsO4)2 • 2H2O [CNMNC approved formula]

Named for Georg Brandt (1694-1768), Swedish chemist.

IMA status : Valid species (Pre-IMA 1888) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
40.02.03.02  
  (40) Hydrated Phosphates
  (40.02) where A++ (B++)2 (XO4) · x(H2O)
  (40.02.03) Roselite Subgroup (Monoclinic: P21/c)
  
Nickel-Strunz
(10th edition) :
08.CG.10
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CG) 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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