Metastudtite

 IMA-A 1981-055
Uranium 5.3.1.2
(Dana Classification Number)
(for images see Studtite) 4/H.01-30
(Strunz ID)

Property Data Remarks
Named for: Being the meta- form of Studtite, which is named for Franz Edward Studt, Belgian prospector and geologist, author of the first geological map (1913) of Shava, Zaïre, and
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Uranyl ([UO2]+2) hydroxides and hydrates
        Ianthinite - Paraschoepite series
    		 
    Chemical
        Formula:    		 UO4 · 2H2O  
    Chemical
        Composition:
    Hydrogen: (H) 1.19%
    Oxygen: (O) 28.40%
    Uranium: (U) 70.41%
    		by weight
    Molecular
        Weight:    		 338.06 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.26035 × 1005 3.41 × 10-06 1.68 168.10

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Dipyramidal
    Axial Ratios: a: 0.7414
    b: 1
    c: 0.4794
    Cell Dimensions: a: 6.51 Å
    b: 8.78 Å
    c: 4.21 Å
    Z: 2
    V: 240.63 Å3
    DenCalc: 4.67
    H-M Symbol: 2/m 2/m 2/m
    Space Group: Immm
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 5.22 Å
    (0.8): 3.54 Å
    (0.5): 4.38 Å
    		 
    Habit:
  • Acicular crystals
  • Radial clusters
    		•   
    Cleavage:
    [001]  
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		    
    Density: 4.67 grams/cm3
    Color: Light to Pale yellow  
    Streak: Light to Pale yellow  
    Luster: Silky  
    Diaphaneity:    
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Secondary uranium mineral containing peroxide formed by the alpha-radiolysis of water during formation
  • (May also form in spent-fission fuel elements)
    		•   
    Associated
        Minerals:

    Barite, Becquerelite, Billietite, Cuprosklodowskite, Curite, Dewindtite, Ianthinite, Kasolite, Liebigite, Metatorbernite, Phosphuranylite, Rutherfordine, Saléeite, Schoepite, Sklodowskite, Soddyite, Studtite, Torbernite, Uraninite, Uranophane, Vandendriesscheite, Wolsendorfite, Zippeite

    Mineral   -   Both of the sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Metastudtite
    Locations:

    Extremely rare

    Metastudtite Locations
    Notes:

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

    Crystals are probably metamic.