Mineral Information and Data:

Grimselite  
K3Na(UO2)(CO3)3 • H2O [CNMNC approved formula]

Named for the locality: Gerstenegg (Kabelstollen Gerstenegg-Grimsel I), Grimsel, Bern, Switzerland.

IMA status : Approved Species 1972 ()
CLASSIFICATION 
Dana
(8th edition) :
15.02.06.01  
  (15) Hydrated Carbonates
  (15.02) where A+m B++n (XO3)p · x(H2O), (m+n):p > 1:1
  (15.02.06)
  
Nickel-Strunz
(10th edition) :
05.ED.35
  (05) Carbonates and Nitrates
  (05.E) Uranyl Carbonates
  (05.ED) UO2:CO3 = 1:3
  
Crystal system: Hexagonal System
Point group (H-M): 6m2 (or 6m2) — ditrigonal-dipyramidal
  
  
  
Other Properties: Radioactive. H2O Soluble.
Comments: Radioactive.

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