Mineral Information and Data:

Arrojadite-(KNa)
KNa3(CaNa2)Fe2+13Al(PO4)11(PO3OH)(OH)2 [CNMNC approved formula]

Named after arrojadite and site occupancy of the arrojadite structure.

IMA status : Approved Species 2005 (IMA2005-047)
CLASSIFICATION 
Dana
(8th edition) :
41.07.02a.01  (This Dana# Added)
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.07) where (A B)m (XO4)4 Zq
  (41.07.02a) Arrojadite Group (Arrojadite Subgroup) (Al in Al site, OH in W site, Fe in M site)
  
Nickel-Strunz
(10th edition) :
08.BF.05
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BF) With medium-sized and large cations, (OH, etc.):RO4< 0.5:1
  
Crystal system: Monoclinic System
Point group (H-M): m — domatic
Unit cell: a = 16.552Å, b = 10.0529Å, c = 24.6477Å β = 106.509°
  
  
  

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