Lepersonnite-(Gd)

 IMA-A 1981-036
Uranium 17.1.12.1
(Dana Classification Number)
(No Images) 8/B.38-10
(Strunz ID)

Property Data Remarks
Named for: Jacques Lepersonne (1909-), honorary head of the Department of Geology and Mineralogy, Musee Royale de l'Afrique Centrale, Brussels, Belgium
Alternate
    Name(s):
  		•  
    Mineral Class:
    Silicates
      Nesosilicates
    "Insel" silicates with anions unfamiliar to tetraheders.
    Uranyl-"Insel" silicates with [UO2]+2 - [SiO4]-4
        Lepersonnite-(Gd) series
    		 
    Chemical
        Formula:    		 CaGd2(UO2)24(CO3)8(SiO4)4 · 48H2O  
    Chemical
        Composition:
    Calcium: (Ca) 0.47%
    Carbon: (C) 1.12%
    Gadolinium: (Gd) 3.68%
    Hydrogen: (H) 1.13%
    Oxygen: (O) 25.45%
    Silicon: (Si) 1.31%
    Uranium: (U) 66.83%
    		by weight
    Molecular
        Weight:    		 8,548.38 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.19704 × 1005 3.24 × 10-06 1.60 15.98

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic
    Axial Ratios: a: 0.4185
    b: 1
    c: 0.3024
    Cell Dimensions: a: 16.23 Å
    b: 38.78 Å
    c: 11.73 Å
    Z: 2
    V: 7,382.85 Å3
    DenCalc: 3.85
    H-M Symbol:  
    Space Group: Pnnm, Pnn2
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 8.15 Å
    (0.8): 3 Å
    (0.7): 4.04 Å
    		 
    Habit:
  • Encrustations
  • Spherical
  • Aggregates
    		•   
    Cleavage:
    [001] Good
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		    
    Density: 3.97 grams/cm3
    Color: Bright yellow  
    Streak: Light yellow  
    Luster: Vitreous  
    Diaphaneity: Transparent to Translucent  
    Pleochroism:
    (x): Pale yellow
    (y:) Bright yellow
    (z:) Bright yellow
    		 
    Ultra Violet
        Fluorescence:    		 Non-fluorescent  
    Magnetism: Non-magnetic  
    Occurance:
  • In a black crust in the lower portion of the oxidation zone
    		•   
    Associated
        Minerals:

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

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Lepersonnite-(Gd)
    Localities:

    Extremely rare

    Lepersonnite-(Gd) localities
    Notes:

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

    Crystals are probably metamic.