Widenmannite

 IMA-A 1974-008
Uranium 14.1.5.1
(Dana Classification Number)
(No Images) 5/F.07-10
(Strunz ID)

Property Data Remarks
Named for: Bergrat J. F. Widenmann (1764-1798), who first discovered uranium containing micas in the Schwarzwald
Alternate
    Name(s):
  		•  
    Mineral Class: Nitrates, Carbonates & Borates -
    - Widenmannite series    		  
    Chemical
        Formula:    		 Pb2(UO2)(CO3)3  
    Chemical
        Composition:
    Carbon: (C) 4.17%
    Oxygen: (O) 20.36%
    Lead: (Pb) 47.94%
    Uranium: (U) 27.54%
    		by weight
    Molecular
        Weight:    		 864.46 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    4.9288 × 1004 1.33 × 10-06 0.65 64.63

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic
    Axial Ratios: a:b:c = 0.9604:1:0.5288
    Cell Dimensions: a = 8.99, b = 9.36, c = 4.95, Z = 2; V = 416.52 Den(Calc) = 6.89
    H-M Symbol:
    Space Group: Pnnm, Pnm21, or P22121
    X Ray Diffraction: By Intensity(I/Io): 2.34(1) 4.16(1) 3.19(0.8)
    		 
    Habit:
  • Tabular
  		•   
    Cleavage:
    [001]
    [010]
    [100] Perfect
    		 
    Fracture: Fragile  
    Moh's
        Hardness:    		 2  
    Density: 6.89 grams/cm3
    Color: Yellow  
    Streak: White  
    Luster: Silky - Pearly  
    Diaphaneity:    
    Pleochroism:
    (x):
    (y:)
    (z:)
    		 
    Ultra Violet
        Fluorescence:    		 Non-fluorescent  
    Magnetism: Non-magnetic  
    Occurance:
  • Alteration zone mineral
  		•   
    Associated
        Minerals:

    Barite, Bismuth, Bornite, Brochantite, Calcite, Cerussite, Chalcopyrite, Copper, Cuprite, Dolomite, Erythrite, Galena, Graphite, Kasolite, Lavendulan, Malachite, Marcasite, Meta-Autunite, Pyrite, Quartz, Rutile, Sphalerite, Tennantite, Torbernite, Uraninite, Uranophane, Vandendriesscheite, Wulfenite, Zeunerite

    Mineral   -   > 40% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Widenmannite
    Locations:

    Very rare

    Widenmannite Locations
    Notes:

    Radioactive a- and b-particles, g-rays.

    Crystals are probably metamic.