Mineral Information and Data:

Niocalite
Ca7Nb(Si2O7)2O3F [CNMNC approved formula]

Named for its composition (Niobium, Calcium).

IMA status : Valid species (Pre-IMA 1956) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
56.02.04.06  
  (56) Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02) with cations in [4] and/or >[4] coordination
  (56.02.04) Cuspidine - Wohlerite group
  
Nickel-Strunz
(10th edition) :
09.BE.17
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BE) Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
  
Crystal system: Monoclinic System
Point group (H-M): m — domatic
  
  
  

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