Studtite

 IMA-GP
Uranium 5.3.1.1
(Dana Classification Number)
(No Images) 4/H.01-20
(Strunz ID)
Unless sealed in glass, all specimens should be considered to have become Metastudtite within a few months of being exposed to ambient air.

Property Data Remarks
Named for: Franz Edward Studt, Belgian prospector and geologist, author of the first geological map (1913) of Shava, Zaire
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Uranyl ([UO2]+2) hydroxides and hydrates
        Ianthinite - Paraschoepite series
    		 
    Chemical
        Formula:    		 UO4 · 4H2O  
    Chemical
        Composition:
    Hydrogen: (H) 2.16%
    Oxygen: (O) 34.2%
    Uranium: (U) 63.63%
    		by weight
    Molecular
        Weight:    		 374.09 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.13896 × 1005 3.08 × 10-06 1.56 156.34

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Prismatic
    Axial Ratios: a: 1.7426
    b: 1
    c: 0.625
    Cell Dimensions: a: 11.85 Å
    b: 6.8 Å
    c: 4.25 Å
    Z: 2
    b: 93.85°
    V: 341.69 Å3
    DenCalc: 3.64
    H-M Symbol: 2/m
    Space Group: C2, Cm, C2/m
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 5.92 Å
    (0.8): 3.4 Å
    (0.6): 2.96 Å
    		 
    Habit:
  • Acicular
  • Encrustations
    		•   
    Cleavage: None  
    Fracture: Flexible  
    Moh's
        Hardness:    		 1 - 2  
    Density: 3.64 grams/cm3
    Color: Yellow to pale yellow  
    Streak: Light yellow  
    Luster:    
    Diaphaneity: Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:    		 Non-fluorescent  
    Magnetism: Non-magnetic  
    Occurance:
  • Secondary uranium mineral, uranyl peroxide formed by the alpha-particle radiolysis of water
  • May also be form in spent fission reactor fuel rods if the contained uranium comes in contact with water
    		•   
    Associated
        Minerals:

    Autunite, Barite, Becquerelite, Billietite, Bornite, Calcite, Chalcocite, Chalcopyrite, Chrysocolla, Coffinite, Covellite, Cuprosklodowskite, Curite, Dewindtite, Digenite, Dolomite, Erythrite, Fourmarierite, Galena, Goethite, Hematite, Ianthinite, Idaite, Kasolite, Liebigite, Löllingite, Malachite, Masuyite, Meta-Autunite, Metatorbernite, Metazeunerite, Novácekite, Phosphuranylite, Pyrite, Pyrolusite, Quartz, Rutherfordine, Safflorite, Saléeite, Schoepite, Silver, Sklodowskite, Soddyite, Sphalerite, Torbernite, Tyuyamunite, Urancalcarite, Uraninite, Uranophane, Uranophane-beta, Vandenbrandeite, Vandendriesscheite, Wolsendorfite, Zeunerite, Zippeite

    Mineral   -   > 64% of sites
    Mineral   -   > 45% of sites
    Mineral   -   > 27% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Studtite
    Locations:

    Rare

    Studtite Locations
    Notes:

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

    Crystals are probably metamict.