Mineral Information and Data:

Belkovite
Ba3Nb6(Si2O7)2O12 [CNMNC approved formula]

Named for I.V. Bel'kov (1917-1989), Soviet mineralogist who explored the Kola Peninsula, Russia.

IMA status : Approved Species 1989 ()
CLASSIFICATION 
Dana
(8th edition) :
55.04.03.01  (This Dana# Added)
  (55) Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04) with cations in [8] and lower coordination
  (55.04.03)
  
Nickel-Strunz
(10th edition) :
09.BE.75
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BE) Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
  
Crystal system: Hexagonal System
Point group (H-M): 6m2 (or 6m2) — ditrigonal-dipyramidal
  
  
  

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