Mineral Information and Data:

Tachyhydrite
CaMg2Cl6 • 12H2O [CNMNC approved formula]

Named From the Greek for "quick water", in allusion to its ready deliquescence.

IMA status : Valid species (Pre-IMA 1856) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
11.05.05.01  
  (11) Halide Complexes; Alumino-fluorides
  (11.05) where (A)m B (X)6
  (11.05.05)
  
Nickel-Strunz
(10th edition) :
03.BB.35
  (03) Halides
  (03.B) Simple Halides, with H2O
  (03.BB) M:X = 1:2
  
Crystal system: Trigonal System
Point group (H-M): 3 — rhombohedral
  
  
  

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