Mineral Information and Data:

Meta-autunite  
Ca(UO2)2(PO4)2 • 6H2O [CNMNC approved formula]

Named as the lower hydrate of autunite.

IMA status : Valid species (Pre-IMA 1938) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
40.02a.01.02  
  (40) Hydrated Phosphates
  (40.02a) where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++
  (40.02a.01) Autunite Group
  
Nickel-Strunz
(10th edition) :
08.EB.10
  (08) Phosphates, Arsenates, Vanadates
  (08.E) Uranyl Phosphates and Arsenates
  (08.EB) UO2:RO4 = 1:1
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
  
  
  
Other Properties: Radioactive.
Comments: Radioactive

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