Mineral Information and Data:

Gregoryite
Na2CO3 [CNMNC approved formula]

Named for John Walter Gregory (1864-1932), University of Melbourne, Melbourne, Australia and University of Glasgow, Glasgow, Scotland.

IMA status : Approved Species 1981 ()
CLASSIFICATION 
Dana
(8th edition) :
14.01.02.02  
  (14) Anhydrous Carbonates
  (14.01) with Simple Formula A+ CO3
  (14.01.02) Vaterite Group
  
Nickel-Strunz
(10th edition) :
05.AA.10
  (05) Carbonates and Nitrates
  (05.A) Carbonates without additional anions, without H2O
  (05.AA) Alkali carbonates
  
Crystal system: Hexagonal System
Point group (H-M): 6mm — dihexagonal-pyramidal
  
  
  
Other Properties: H2O Soluble.

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