Mineral Information and Data:

Arctite
Na5Ca7Ba(PO4)6F3 [CNMNC approved formula]

Named for the arctic region where it was found.

IMA status : Approved Species 1981 (IMA1980-049)
CLASSIFICATION 
Dana
(8th edition) :
41.05.18.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.05) where (A B)2 (XO4) Zq
  (41.05.18)
  
Nickel-Strunz
(10th edition) :
08.BN.10
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BN) With only large cations, (OH, etc.):RO4 = 0.33:1
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Unit cell: a = 7.094 Å, c = 41.320 Å
  
Color: Colorless
Diaphaneity: Transparent
Luster: Vitreous, pearly on cleavages
Hardness (Mohs): 5
Measured Density: 3.13 g/cm3
Cleavage: 1; {0001} perfect
Streak: White
  
Geologic Setting: A late-stage pneumatolytic mineral in pegmatitic veinlets in a differentiated alkalic massif.
Mineral Association: Natrosilite, vuonnemite, lomonosovite, zirsinalite, natisite, rasvumite, villiaumite, aegirine, thenardite, umbite, paraumbite, kostylevite, wadeite
  

 

Arctite
Origin: Koashva Mt, Chibiny, Kola, Russia
Sample size: 2.5 x 4 cm
Photo: Diederik Visser

 

Arctite
(zoom-in of above)

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