Yttrotantalite-(Y)

 IMA-GP
Uranium 8.1.3.1
(Dana Classification Number)
(No Images) 4/D.19-90
(Strunz ID)

Property Data Remarks
Named for: Its Yttrium content and relation to tantalite
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Oxides with metal: (metal:oxygen = 1:2)
    (MO2 and related compounds)
        Polycrase-(Y) - Loranskite-(Y) series
    		 
    Chemical
        Formula:    		 (Y,U,Fe+2)(Ta,Nb)O4  
    Chemical
        Composition:
    Iron: (Fe) 3.54%
    Oxygen: (O) 20.27%
    Niobium: (Nb) 8.83%
    Tantalum: (Ta) 40.12%
    Uranium: (U) 7.54%
    Yttrium: (Y) 19.71%
    		by weight
    Molecular
        Weight:    		 315.74 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.3494 × 1004 3.65 × 10-07 0.18 18.35

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Prismatic
    Axial Ratios: a:b:c = 0.4881:1:0.4634
    Cell Dimensions: a = 5.34, b = 10.94, c = 5.07, Z = 3; beta = 95.3° V = 294.92 Den(Calc)= 5.33
    H-M Symbol: 2/m
    Space Group: I2/a
    X Ray Diffraction: By Intensity(I/Io): 2.95(1) 1.81(0.9) 1.55(0.9) 2.56(0.6) 1.183(0.6) 1.152(0.6) 1.053(0.5)
    		 
    Habit:
  • Prismatic
  		•   
    Cleavage:
    [001]
    [010] Imperfect
    [100]
    		 
    Fracture: Conchoidal  
    Moh's
        Hardness:    		 5 - 5.5  
    Density: 5.5 - 5.9 grams/cm3
    Color: Brownish black  
    Streak: Colorless gray  
    Luster: Sub-metallic  
    Diaphaneity: Opaque to Sub-translucent  
    Pleochroism:
    (x):
    (y:)
    (z:)
    		 
    Ultra Violet
        Fluorescence:    		 Non-fluorescent  
    Magnetism: Non-magnetic  
    Occurance:
  • Accessory mineral in granite pegmatites
  		•   
    Associated
        Minerals:

    'Allanite', 'Apatite', Bertrandite, Beryl, Biotite, Bismuth, Bismuthinite, Cassiterite, Chalcopyrite, 'Columbite', 'Fergusonite', Fluorite, 'Gadolinite', 'Garnet Group', Lepidolite, Magnetite, 'Monazite', Pyrite, Samarskite, Tantalite, Topaz, 'Tourmaline Group', Xenotime-(Y), Zircon

    Mineral   -   > 50% of sites
    Mineral   -   > 22% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Yttrotantalite-(Y)
    Locations:

    Rare

    Yttrotantalite-(Y) Locations
    Notes:

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

    Crystals are possibly metamic.