Mineral Information and Data:

Niobophyllite
K2NaFe2+7(NbTi)(Si4O12)2O2(OH)4O [CNMNC approved formula]

Named for the niobium content and foliated character common to the astrophyllite group.

IMA status : Approved Species 1964 ()
CLASSIFICATION 
Dana
(8th edition) :
69.01.01.04  
  (69) Inosilicate Chains with Side Branches or Loops
  (69.01) with (P=2, and N=4, 2 branches)
  (69.01.01) Astrophyllite group
  
Nickel-Strunz
(10th edition) :
09.DC.05
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DC) with branched 2-periodic single chains; Si2O6 + 2SiO3 Si4O12
  
Crystal system: Triclinic System
Point group (H-M): Unknown — Unk
  
  
  

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