Przhevalskite

 IMA-GP
Uranium 40.2a.21.1
(Dana Classification Number)
(No Images) 7/E.09-10
(Strunz ID)

Property Data Remarks
Named for: Nikolai M. Przhevalsky (1839-1888), Russian explorer
Alternate
    Name(s):
  		•  
    Mineral Class:
    Phosphates, Arsenates and Vanadates
      Uranylphosphates and uranylvanadates with
    [UO2]+2 - [PO4 | AsO4]-3 and
    [UO2]+2 - [V2O8]-6
        Przhevalskite series
    		 
    Chemical
        Formula:    		 Pb(UO2)2(PO4)2 · 4H2O  
    Chemical
        Composition:
    Hydrogen: (H) 0.80%
    Lead: (Pb) 20.53%
    Oxygen: (O) 25.36%
    Phosphorus: (P) 6.14%
    Uranium: (U) 47.17%
    		by weight
    Molecular
        Weight:    		 1,009.26 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    8.4433 × 1004 2.28 × 10-06 1.13 113.16

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Tetragonal
    Axial Ratios: a: 1
    c: 2.51657
    Cell Dimensions: a: 7.24 Å
    c: 18.22 Å
    Z: 2
    V: 955.05 Å3
    DenCalc: 3.51
    H-M Symbol:  
    Space Group:  
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.61 Å
    (0.9): 9.08 Å
    (0.6): 1.619 Å
    		 
    Habit:
  • Foliated
  • Aggregates
    		•   
    Cleavage:
    [001] Distinct
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		 2 - 3  
    Density:   grams/cm3
    Color: Yellow, Bright Greenish yellow  
    Streak: Pale yellow  
    Luster: Adamantine - Pearly  
    Diaphaneity:    
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:    		 Fluorescent  
    Magnetism: Non-magnetic  
    Occurance:
  • Found in the oxidation zone of a pitchblende-sulfide deposit
    		•   
    Associated
        Minerals:

    Autunite, Dewindtite, Dumontite, Halloysite, Kaolinite, Torbernite, Uranophane, Wulfenite

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Przhevalskite
    Locations:

    Extremely rare

    Przhevalskite Locations
    Notes:

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

    Crystals are probably metamic.