Mineral Information and Data:

Clarkeite  
Na(UO2)O(OH) • nH2O [CNMNC approved formula]

Named for Frank Wigglesworth Clarke (1847-1931), prominent American geochemist of the US Geological Survey.

IMA status : Valid species (Pre-IMA 1931) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
05.04.01.01  
  (05) Oxides Containing Uranium and Thorium
  (05.04) with alkaline-earth elements (hydrated)
  (05.04.01)
  
Nickel-Strunz
(10th edition) :
04.GC.05
  (04) Oxides and Hydroxides
  (04.G) Uranyl Hydroxides
  (04.GC) With additional cations; with mainly UO2(O,OH)6 hexagonal polyhedra
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
  
  
  
Other Properties: Radioactive.

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