Mineral Information and Data:

Hainite
Na(Na,Ca)2Ca2(Ca,Zr,Y)2Ti(Si2O7)2F2F2 [CNMNC approved formula]

Named for the locality: Hradiste Mountain, (formerly named Hoher Hain) near Mildenau, Czech Republic.

IMA status : Valid species (Pre-IMA 1893) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
56.02.04.09  
  (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.22
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BE) Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  

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