Plumbobetafite

 IMA-A 1977-SUB
Uranium 8.2.3.3
(Dana Classification Number)
(No Images) 4/C.16-40
(Strunz ID)

Property Data Remarks
Named for: Its relationship to Betafite, and its lead content
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Oxides with metal:
    (metal:oxygen = 2:3)
    (M2O3 and related compounds)
        Pyrochlore group
          Betafite series
    [with Ti > (Nb,Ta)]
    		 
    Chemical
        Formula:    		 (Pb,U,Ca)(Ti,Nb)2O6(OH,F)  
    Chemical
        Composition:
    Calcium: (Ca) 1.88%
    Fluorine: (F) 1.78%
    Hydrogen: (H) 0.14%
    Lead: (Pb) 24.33%
    Niobium: (Nb) 8.73%
    Oxygen: (O) 24.79%
    Sodium: (Na) 0.54%
    Titanium: (Ti) 14.61%
    Tungsten: (W) 8.63%
    Uranium: (U) 11.18%
    REE2O3:
        Lanthanum
        Cerium
        Preaseodymium
        Neodymium
        Samarium    		  
    (La)
    (Ce)
    (Pr)
    (Nd)
    (Sm)    		 | 
    |
    |
    |
    |
    |    		 3.38%
    		by weight
    Molecular
        Weight:    		 425.90 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    2.0084 × 1004 5.43 × 10-07 0.28 27.67

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Isometric - Hexoctahedral
    Cell Dimensions: a: 10.33 Å
    Z: 8
    V: 1,102.30 Å3
    DenCalc: 5.13
    H-M Symbol: 4/m -3 2/m
    Space Group: Fd3m
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (0.):   Å
    (0.):   Å
    (0.):   Å
    		 
    Habit:
  • Cubic Crystals
  • Crystals likely metamict
    		•   
    Cleavage: None  
    Fracture: Uneven  
    Moh's
        Hardness:    		 4.5 - 5.5  
    Density: 4.64 grams/cm3
    Color: Yellow, brown  
    Streak:    
    Luster: Adamantine  
    Diaphaneity: Translucent to Opaque  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • An accessory mineral in a pegmatitic dike in nepheline syenite
    		•   
    Associated
        Minerals:

    Aegirine, Albite, 'Amphibole Group', 'Apatite', Astrophyllite, Bafertisite, Bertrandite, Biotite, 'Brewsterite', Brookite, Burpalite, 'Calcium-Catapleiite', Catapleiite, 'Chabazite', 'Chevkinite', Cryolite, Eudialyte, Fluorite, Hambergite, Kupletskite, Lamprophyllite, Landauite, Leucophanite, Loparite-(Ce), Lorenzenite, Låvenite, Microcline, Monazite, Murataite, Nepheline, Neptunite, Perrierite-(Ce), Polylithionite, Pyrochlore, Pyrophanite, Quartz, Riebeckite, Seidozerite, 'Strontium-Apatite', Tainiolite, Thorianite, Thorite, Titanite, Vlasovite, Zircon

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Plumbobetafite
    Locations:

    Extremely rare

    Plumbobetafite Locations
    Notes:

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

    Crystals are probably metamic.