Davidite-(Ce)

 IMA-A 1966-LEV
Uranium
(Minor)		 8.5.1.6
(Dana Classification Number)
(No Images) 4/C.09-70
(Strunz ID)

Property Data Remarks
Named for: Tenatt William Edgeworth David(1858-1934), Australian geologist, and its composition
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Oxides with metal:
    (metal:oxygen = 2:3 (M2O3 and related compounds)
        Crichtonite group
    		 
    Chemical
        Formula:    		 (Ce,La)(Y,U)(Ti,Fe+3)20O38  
    Chemical
        Composition:
    Cerium: (Ce) 5.62%
    Iron: (Fe) 14.92%
    Lanthanum: (La) 1.86%
    Oxygen: (O) 32.49%
    Titanium: (Ti) 38.38%
    Uranium: (U) 3.18%
    Yttrium: (Y) 3.56%
    		by weight
    Molecular
        Weight:    		 1,871.41 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    5.859 × 1003 1.58 × 10-07 0.09 8.57

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Trigonal - Rhombohedral
    Axial Ratios: a: 1
    c: 2.01522
    Cell Dimensions: a: 10.376 Å
    c: 20.91 Å
    Z: 3
    V: 1,949.60 Å3
    DenCalc: 4.78
    H-M Symbol: -3
    Space Group: R-3
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 1.69 Å
    (1): 1.7 Å
    (0.9): 1.435 Å
    (0.8): 2.23 Å
    (0.8): 2.86 Å
    (0.8): 1.59 Å
    (0.7): 3.21 Å
    (0.7): 3.37 Å
    		 
    Habit:
  • Tabular crystals
  • Pyramidal crystals
    		•   
    Cleavage: None  
    Fracture: Conchoidal  
    Moh's
        Hardness:    		 6  
    Density: 4.42 - 4.46 grams/cm3
    Color: Black  
    Streak: Grayish black  
    Luster: Vitreous - metallic  
    Diaphaneity: Opaque  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Uranium rich pegmatites
    		•   
    Associated
        Minerals:

    Albite, Allanite-(Ce), 'Apatite', Bastnäsite-(Ce), Bertrandite, Betafite, Biotite, Calcite, Cerianite-(Ce), Cerite-(Ce), Chalcopyrite, Dolomite, Epidote, Ferrocolumbite, Fluorite, Forsterite, 'Gmelinite Series', Goethite, Gypsum, Hematite, 'Hornblende', Hydroxyapophyllite, Ilmenite, Laumontite, Magnetite, Malachite, Marcasite, Molybdenite, Monazite-(Ce), Muscovite, Phlogopite, Pyrite, Pyrrhotite, Quartz, Rutile var: Ilmenorutile, Stilpnomelane, Thorite, Thortveitite, Titanite, 'Tourmaline Group', Uraninite, Uranophane, Xenotime-(Y), Zircon

    Mineral   -   > 67% of sites
    Mineral   -   > 50% of sites
    Mineral   -   > 33% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Davidite-(Ce)
    Localities:

    Very rare

    Davidite-(Ce) Localities
    Notes:

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