Mineral Information and Data:

Compreignacite  
K2(UO2)6O4(OH)6 • 7H2O [CNMNC approved formula]

Named for the locality : Margnac mine, Compreignac, Haute-Vienne, France.

IMA status : Approved Species 1964 ()
CLASSIFICATION 
Dana
(8th edition) :
05.07.01.01  
  (05) Oxides Containing Uranium and Thorium
  (05.07) with alkaline or hydrated hydroxide components
  (05.07.01)
  
Nickel-Strunz
(10th edition) :
04.GB.05
  (04) Oxides and Hydroxides
  (04.G) Uranyl Hydroxides
  (04.GB) With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  
Other Properties: Radioactive.

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