Mineral Information and Data:

Arrojadite-(BaFe)
BaFe2+(CaNa2)Fe2+13Al(PO4)11(PO3OH)(OH)2 [CNMNC approved formula]

Named Originally for Pietro Sigismund (1874-1962), renamed arrojadite-(BaFe) in 2006 by the IMA.

IMA status : Approved Species 1996 (IMA1994-033)
CLASSIFICATION 
Dana
(8th edition) :
41.07.02a.05  
  (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 = 16.406(5) Å, b = 9.945(3) Å, c = 24.470(5) Å, b = 105.73°
Crystal Habit: as aggregate crystals to 4cm
  
Color: Grayish green
Diaphaneity: Translucent
Luster: Greasy
Measured Density: 3.54 g/cm3
Tenacity: Brittle
Streak: White
  
Geologic Setting: Found in phengitic quartzite
Mineral Association: Quartz, apatite, lazulite
  
Synonyms/varieties: Sigismundite
Comments: Name changed from sigismundite:
Chopin C, Oberti R, Camara F (2006) The arrojadite enigma: II. Compositional space, new members, and nomenclature of the group, American Mineralogist 91, 1260-1270

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