Compreignacite

 IMA-A 1964-026
Uranium 5.7.1.1
(Dana Classification Number)
(No Images) 4/H.03-10
(Strunz ID)

Property Data Remarks
Named for: Compreignac, Razès, Haute-Vienne, Limousin, France, its type locality
Alternate
    Name(s):
  • (also see Rameauite)
    		•   
    Mineral Class:
    Oxides
      Uranyl ([UO2]2+) hydroxides and hydrates
        Compreignacite - Billietite series
    		 
    Chemical
        Formula:    		 K2(UO2)6O4(OH)6 · 8(H2O  
    Chemical
        Composition:
    Hydrogen: (H) 1.10%
    Oxygen: (O) 23.90%
    Potassium: (K) 3.89%
    Uranium: (U) 71.11%
    		by weight
    Molecular
        Weight:    		 2,008.53 daltons (amu)
    Specific
        Radioactivity:

    (All radiation is for a 1 gram, fully aged specimen)

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.27280 × 1005 3.44 × 10-06 1.69 16.91

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Dipyramidal
    Axial Ratios: a: 0.5897
    b: 1
    c: 1.2257
    Cell Dimensions: a: 7.16 Å
    b: 12.14 Å
    c: 14.88 Å
    Z: 2
    V: 1,293.41 Å3
    DenCalc: 5.16
    H-M Symbol: 2/m 2/m 2/m
    Space Group: Pnmn
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 7.4 Å
    (0.8): 3.19 Å
    (0.8): 3.53 Å
    		 
    Habit:
  		•  
    Cleavage:
    [001]  
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		    
    Density: 5.03 grams/cm3
    Color: Yellow  
    Streak:    
    Luster:    
    Diaphaneity:    
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Anatase, Aragonite, Arsenopyrite, Autunite, Barite, Becquerelite, Bismuthinite, Bornite, Brochantite, Calcite, Cassiterite, Chalcanthite, Chalcocite, Chalcopyrite, Coffinite, Copper, Cuprite, Cuprosklodowskite, Dolomite, Fluorite, Galena, Goethite, Hematite, Malachite, Marcasite, Metatorbernite, Metazeunerite, Mixite, Novácekite, Phosphuranylite, Pyrite, Quartz, Rutile, Saléeite, Schoepite, Siderite, Sphalerite, Torbernite, Uraninite, Uranophane, Uranopilite, Vivianite, Zeunerite, Zippeite

    Mineral   -   > 83% of sites
    Mineral   -   > 67% of sites
    Mineral   -   > 50% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Compreignacite
    Localities:

    Very rare

    Compreignacite Localities
    Notes:

    Strongly radioactive a- and b-particles, g-rays.