Mineral Information and Data:

Betpakdalite
MgCa2Fe3+3Mo8(AsO4)2O28(OH) • 23H2O [CNMNC approved formula]

Named for the locality: Bet-Pak-Dal desert, Kazakhstan.

IMA status : Approved Species 1961 ()
CLASSIFICATION 
Dana
(8th edition) :
49.04.01.01  
  (49) Basic and Hydrated Molybdates and Tungstates
  (49.04) (Compound Anions)
  (49.04.01)
  
Nickel-Strunz
(10th edition) :
08.DM.15
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DM) With large and medium-sized cations, (OH, etc.):RO4 > 2:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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