Mineral Information and Data:

Cryptohalite
(NH4)2SiF6 [CNMNC approved formula]

Named from the Greek for concealed and salt, for being admixed with sal ammoniac.

IMA status : Valid species (Pre-IMA 1873) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
11.05.01.02  
  (11) Halide Complexes; Alumino-fluorides
  (11.05) where (A)m B (X)6
  (11.05.01)
  
Nickel-Strunz
(10th edition) :
03.CH.15
  (03) Halides
  (03.C) Complex Halides
  (03.CH) Silicofluorides
  
Crystal system: Cubic System
Point group (H-M): m3m (or 4/m 3 2/m) — hexoctahedral
  
  
  
Other Properties: H2O Soluble.

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