Calciouranoite

 IMA-1974
Uranium 5.4.2.1
(Dana Classification Number)
(No Images) 4/H.06-10
(Strunz ID)
Unless sealed in glass, all specimens should be considered to have become Metacalciouranoite within a few months of being exposed to ambient air.

Property Data Remarks
Named for: Its Calcium and Uranium content
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Uranyl ([UO2]2+) hydroxides and hydrates
        Calciouranoite - Wölsendorfite series
    		 
    Chemical
        Formula:    		 (Ca,Ba,Pb)U2O7 · 5H2O  
    Chemical
        Composition:
    Barium: (Ba) 2.06%
    Calcium: (Ca) 4.20%
    Hydrogen: (H) 1.45%
    Lead: (Pb) 3.10%
    Oxgen: (O) 28.27%
    Sodium: (Na) 0.34%
    Uranium: (U) 60.58%
    		by weight
    Molecular
        Weight:    		 667.92 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.08444 × 1005 2.93 × 10-06 1.47 147.07

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)

    Crystalography:
    System: Triclinic
    Axial Ratios: a:  
    b:  
    c:  
    Cell Dimensions: a:   Å
    b:   Å
    c:   Å
    Z:  
    a:   °
    b:   °
    g:   °
    V:   Å3
    DenCalc:  
    H-M Symbol:   -
    Space Group:   -
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.05 Å
    (1): 3.406 Å
    (1): 4 Å
    		 
    Habit:
  • Radial
  • Acicular
  • Prismatic
  • Amorphous (?)
    		•   
    Cleavage:
    [hk0] Distinct
    		 
    Fracture:    
    Moh's
        Hardness:    		 4  
    Density: 4.62 grams/cm3
    Color: Orange, brown  
    Streak:    
    Luster: Greasy  
    Diaphaneity: Translucent  
    Pleochroism:
    (x): Deep Lemon yellow
    (y:) Deep Lemon yellow
    (z:) Very Pale yellow
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • In felsite stringers, deep in the oxidation zone of a U-Mo deposit
  • In water-saturated ore-bearing faults
    		•   
    Associated
        Minerals:

    Bauranoite, 'Calcioursilite', Calcite, Gypsum, Kaolinite, Kasolite, 'Magnioursilite', Metacalciouranoite, Sklodowskite, Uraninite, Uranophane

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Calciouranoite
    Localities:

    Extremely rare

    Calciouranoite Localities
    Notes:

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

    Crystals are probably metamic.