Roubaultite

 IMA-A 1970-030
Uranium 16b.7.13.1
(Dana Classification Number)
(No Images) 5/F.03-10
(Strunz ID)

Property Data Remarks
Named for: Marcel Roubault (1905-1974), geologist, University of Nancy, and Director of the Ecole Nationale Supérieure de Géologie Appliquée et de Prospection Minière, Nancy, France
Alternate
    Name(s):
  		•  
    Mineral Class:
    Nitrates, Carbonates and Borates
      Uranylcarbonates ([UO2]+2 - [CO3]-2)
        Roubaultite - Voglite series
    		 
    Chemical
        Formula:    		 Cu2(UO2)3(CO3)2O2(OH)2 · 4H2O  
    Chemical
        Composition:
    Carbon: (C) 2.01%
    Copper: (Cu) 10.63%
    Hydrogen: (H) 0.84%
    Oxygen: (O) 26.77%
    Uranium: (U) 59.74%
    		by weight
    Molecular
        Weight:    		 1,195.27 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.06940 × 1005 2.89 × 10-06 1.45 144.55

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Triclinic - Pinacoidal
    Axial Ratios: a: 1.1188
    b: 1
    c: 1.1307
    Cell Dimensions: a: 7.767 Å
    b: 6.942 Å
    c: 7.85 Å
    Z: 1
    a: 92.16°
    b: 90.89°
    g: 93.48°
    V: 422.13 Å3
    DenCalc: 4.70
    H-M Symbol: -1
    Space Group: P-1
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 5.55 Å
    (0.9): 7.74 Å
    (0.8): 6.88 Å
    		 
    Habit:
  • Micaceous
  • Rosette
    		•   
    Cleavage:
    [001]  
    [010] Distinct
    [100] Perfect
    		 
    Fracture:    
    Moh's
        Hardness:    		 3  
    Density: 5.02 grams/cm3
    Color: Green  
    Streak: Green  
    Luster: Vitreous - Greasy  
    Diaphaneity:    
    Pleochroism:
    (x): Colorless
    (y:) Colorless
    (z:) Yellow green
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Oxidation zone of Pitchblende ore deposit
    		•   
    Associated
        Minerals:

    Barite, Becquerelite, Bijvoetite-(Y), Billietite, Cobaltoan Calcite, Carrollite, Cattierite, Chernikovite-(Ce), Comblainite, 'Cousinite', Cuprosklodowskite, Curienite, Curite, Dewindtite, Dumontite, Fourmarierite, Guilleminite, Gysinite-(Nd), Ianthinite, Kasolite, Kolwezite, Lepersonnite-(Gd), Liebigite, Masuyite, Metaschoepite, Metastudtite, Metatorbernite, Metavandendriesscheite, Oursinite, Paraschoepite, Parsonsite, Phosphuranylite, Phurcalite, Piretite, Platinum, Protasite, Richetite, Rutherfordine, Saléeite, Sayrite, Schmitterite, Schoepite, Sengierite, Sharpite, Sklodowskite, Soddyite, Studtite, Torbernite, Umohoite, Urancalcarite, Uraninite, Uranophane, Vaesite, Vandenbrandeite, Vandendriesscheite, Wolsendorfite, Wyartite, Zippeite

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

    		These are minerals known to be found with Roubaultite
    Locations: Extremely rare

    Roubaultite Locations
    Notes:

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

    Most crystal specimens are probably metamic.