Umohoite

 IMA-GP
Uranium 49.2.2.1
(Dana Classification Number)
(No Images) 6/G.05-20
(Strunz ID)

Property Data Remarks
Named for: Its Uranium, Molybdenum and water content
Alternate
    Name(s):
  		•  
    Mineral Class: Sulfates,Chromates,Molybdates and Tungstates -
    - Mourite - Moluranite series    		  
    Chemical
        Formula:    		 (UO2)(MoO4) · H2O  
    Chemical
        Composition:
    Hydrogen: (H) 0.45%
    Oxygen: (O) 25.00%
    Moybdenum: (Mo) 21.24%
    Uranium: (U) 53.13%
    		by weight
    Molecular
        Weight:    		 447.98 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    9.5109 × 1004 2.57 × 10-06 1.28 127.63

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Triclinic - Pinacoidal, and Orthorhombic
    Axial Ratios: a:b:c =0.8467:1:1.9429
    Cell Dimensions: a = 6.3748, b = 7.5287, c = 14.628, Z = 4;
    alpha = 82.64°, beta = 85.95°,
    gamma = 89.91° V = 694.53
    Den(Calc) = 4.28
    H-M Symbol: -1
    Space Group: P-1
    X Ray Diffraction: By Intensity(I/Io): 4.13(1) 3.2(0.5) 3.15(0.4)
    		 
    Habit:
  • Thin veins or as disseminated specks in clay
  • Plate-like crystals
  • Fine grained foliated aggregates
    		•   
    Cleavage: None  
    Fracture:    
    Moh's
        Hardness:    		 1-1/2 - 2  
    Density: 4.53 - 4.93 grams/cm3
    Color: Black to Blue-black, Dark green  
    Streak: Blue-gray  
    Luster: Metallic to Sub-metalic  
    Diaphaneity: Opaque  
    Pleochroism:
    (x):
    (y:)
    (z:)
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:
    Short Wave:
    		 
    Magnetism: Non-magnetic  
    Occurance:
    • Uranium-bearing veins in clay
    		  
    Associated
        Minerals:

    Aragonite, Autunite, Azurite, Barite, Becquerelite, Billietite, Bournonite, Calcite, Calcurmolite, Cerussite, Chalcopyrite, Coffinite, Copper, Covellite, Cuprosklodowskite, Dewindtite, Dolomite, Galena, Gypsum, Heinrichite, Ianthinite, Iriginite, Jarosite, Kahlerite, Liebigite, Malachite, Marcasite, Masuyite, Meta-Autunite, Metaheinrichite, Metalodevite, Metatorbernite, Metazeunerite, Molybdenite, Novácekite, Phosphuranylite, Pyrite, Quartz, Rabejacite, Rutherfordine, Saléeite, Schoepite, Sengierite, Sklodowskite, Soddyite, 'Sodium Uranospinite', Sphalerite, Studtite, Sulphur, Torbernite, Trögerite, Tyuyamunite, Urancalcarite, Uraninite, Uranophane, Uranophane-beta, Uranopilite, Vandenbrandeite, Vandendriesscheite, Wulfenite, Zellerite, Zeunerite, Zippeite

    Mineral   -   > 60% of sites
    Mineral   -   > 50% of sites
    Mineral   -   > 25% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Umohoite
    Locations:

    Very rare

    Umohoite Locations
    Notes:

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