Mineral Information and Data:

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

Named in 1925 and renamed 2006 after arrojadite and site occupancy of the arrojadite structure.

IMA status : Redefined IMA Approved; 2006 ()
CLASSIFICATION 
Dana
(8th edition) :
41.07.02a.02  (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 = 16.53Å, b = 10.05Å, c = 24.75Å β = 105.65°
  
Color: Olive-green
Hardness (Mohs): 5
Measured Density: 3.5 - 3.6 g/cm3
Cleavage: Distinct/Good On {100} good; on {010}, distinct.
  
  

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