Mineral Information and Data:

Barentsite
Na7Al(CO3)2(HCO3)2F4 [CNMNC approved formula]

Named to honor Dutch sailor Willem Barents, the famous Dutch seafarer, for whom the Barents Sea, northeast of the Kola Peninsula, was named.

IMA status : Approved Species 1983 (IMA1982-101)
CLASSIFICATION 
Dana
(8th edition) :
13.01.08.01  
  (13) Acid Carbonates
  (13.01) with miscellaneous formulae
  (13.01.08)
  
Nickel-Strunz
(10th edition) :
05.BB.05
  (05) Carbonates and Nitrates
  (05.B) Carbonates with additional anions, without H2O
  (05.BB) With alkalies, etc.
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 6.472Å, b = 6.735Å, c = 8.806Å α = 92.5°, β = 97.33°, γ = 119.32°
Crystal Habit: Granular, to 5 mm.
  
Color: Colorless if fresh
Diaphaneity: Transparent
Luster: Vitreous, pearly on cleavages; dull when altered
Hardness (Mohs): 3
Measured Density: 2.56 g/cm3
Cleavage: {001} and {110}, perfect.
Tenacity: Brittle
  
Geologic Setting: Rare in hydrothermal veinlets in alkalic pegmatites in a differentiated alkalic massif.
Mineral Association: Shortite, villiaumite, cryolite, neighborite, bonshtedtite, natrite, albite
  
Other Properties: H2O Soluble.
Comments: Alters surficially to a white powder in air; slowly decomposed by H2O

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