Uranopolycrase

 IMA-A 1990-046
Uranium
Thorium		 8.3.8.5
(Dana Classification Number)
(No Images) 4/D.19-15
(Strunz ID)

Property Data Remarks
Named for: Its Uranium content, and its relation to Polycrase
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Oxides with metal: (metal:oxygen = 1:2)
    (MO2 and related compounds)
        Polycrase-(Y) - Loranskite-(Y) series
    		 
    Chemical
        Formula:    		 (U,Y)(Ti,Nb,Ta)2O6  
    Chemical
        Composition:
    Niobium: (Nb) 8.94%
    Oxygen: (O) 23.09%
    Tantalum: (Ta) 4.35%
    Titanium: (Ti) 17.27%
    Thorium: (Th) 5.58%
    Uranium: (U) 34.35%
    Yttrium: (Y) 6.42%
    		by weight
    Molecular
        Weight:    		 415.77 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    6.3987 × 1004 1.73 × 10-06 0.87 87.03

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Dipyramidal
    Axial Ratios: a:b:c = 2.6106:1:0.9307
    Cell Dimensions: a = 14.51, b = 5.558, c = 5.173, Z = 3; V = 417.18 Den(Calc) = 4.96
    H-M Symbol: 2/m 2/m 2/m
    Space Group: Pbcn
    X Ray Diffraction: By Intensity(I/Io): 2.99(1) 1.9(0.5) 1.48(0.4)
    		 
    Habit:
  • Euhedral Crystals
  		•   
    Cleavage:
    [001]
    [010]
    [100] Good
    		 
    Fracture:    
    Moh's
        Hardness:    		 5 - 6  
    Density: 5.5 - 6 grams/cm3
    Color: Brown-red  
    Streak: Grayish brown  
    Luster: Adamantine  
    Diaphaneity: Opaque  
    Pleochroism:
    (x):
    (y:)
    (z:)
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:
    Short Wave:
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Zoned pegmatite vein near the contact with granodiorite
  		•   
    Associated
        Minerals:

    Beryl, Cassiterite, Cookeite, Dachiardite, Elbaite, Euxenite-(Y), Foitite, Manganocolumbite, Manganotantalite, Microlite, Orthoclase, Petalite, Polycrase-(Y), Quartz, Rutile var: Niobian Rutile, Titanowodginite, Tourmaline Group', Wolframoixiolite'

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Uranopolycrase
    Locations:

    Extremely rare

    Uranopolycrase Locations
    Notes:

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

    Crystals are probably metamic.