Bijvoetite-(Y)

 IMA-A 1981-035
Uranium 16b.2.4.1
(Dana Classification Number)
(No Images) 5/F.06-30
(Strunz ID)

Property Data Remarks
Named for: Johannes Martin Bijvoet(1892-1980), Dutch crystallographer
Alternate
    Name(s):
  		•  
    Mineral Class:
    Nitrates, Carbonates and Borates
      Uranylcarbonates ([UO2]4+ - [CO3]2-)
        Astrocyanite-(Ce) - Bijvoetite-(Y) series
    		 
    Chemical
        Formula:    		 (Y,REE)8(H2O)25(UO2)16O8(OH)8(CO3)16 · 11-14H2O

    or

    (Y,Dy)2(UO2)4(CO3)4(OH)6 · 11H2O    		  
    Chemical
        Composition:
    Carbon: (C)   2.72%
    Hydrogen: (H) 1.23%
    Oxygen: (O) 30.56%
    Uranium: (U) 53.88%
    Yttrium: (Y) 7.55%
    REE (REE2O3)
        Lanthanum:
        Cerium:
        Neodymium:
        Praeseodymium:
        Samarium:    		  
    (La)
    (Ce)
    (Nd)
    (Pr)
    (Sm)    		 |  
    |
    |
    |
    |
    |
    		 4.07%
    		by weight
    Molecular
        Weight:    		 7,068.68 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    9.6533 × 1004 2.61 × 10-06 1.32 132.13

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Sphenoidal (pseudo-Ortho)
    or:
    Orthorhombic
    Axial Ratios: a: 1.6386
    b: 1
    c: 3.4658
    Cell Dimensions: a: 21.234 Å
    b: 12.958 Å
    c: 44.911 Å
    Z: 4
    b: 90°
    V: 12,357.27 Å3
    DenCalc: 3.80
    H-M Symbol: 2
    Space Group: B1211
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 6.7 Å
    (0.8): 8.61 Å
    (0.6): 4.16 Å
    		 
    Habit:
  • Microscopic Crystals
  • Tabular
    		•   
    Cleavage:
    [001] Perfect
    [010]
    [100]
    		 
    Fracture:    
    Moh's
        Hardness:    		 2  
    Density: 3.9 grams/cm3
    Color: Sulphurous yellow to Yellow  
    Streak: Light yellow  
    Luster: Vitreous  
    Diaphaneity:    
    Pleochroism:
    (x):
    (y:)
    (z:)
    		 
    Ultra Violet
        Fluorescence:    		 Non-fluorescent  
    Magnetism: Non-magnetic  
    Occurance:
  • Lower portion of the oxidation zone of a uranium deposit
  		•   
    Associated
        Minerals:

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

    NOTE: Shinkolobwe mine, Congo (Zaïre), is a virtual 'shopping cart' of uranium minerals. It is also the type locale for many of these minerals.

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with
    Bijvoetite-(Y)
    Localities:

    Very rare

    Bijvoetite-(Y) Localities
    Notes:

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

    Crystals are probably metamic.