Metatyuyamunite

 IMA-GP
Uranium 40.2a.26.2
(Dana Classification Number)
(No Images) 7/E.11-90
(Strunz ID)

Property Data Remarks
Named for: being the meta- form of Tyuyamunite
Alternate
    Name(s):
  		•  
    Mineral Class:
    Phosphates, Arsenates and Vanadates
      Uranylphosphates and uranylvanadates with:
    [UO2]+2 - [PO4 | AsO4]-3 and [UO2]+2 - [V2O8]-6,
    uranyl-groupvanadates with [UO2]+2 - [V2O8]-6
        Tyuyamunite series
    		 
    Chemical
        Formula:    		 Ca(UO2)2V2O8 · 3H2O  
    Chemical
        Composition:
    Calcium: (Ca) 4.64%
    Hydrogen: (H) 0.70%
    Oxygen: (O) 27.77%
    Uranium: (U) 55.10%
    Vanadium: (V) 11.79%
    		by weight
    Molecular
        Weight:    		 864.06 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    9.8621 × 1004 2.67 × 10-06 1.34 13.4

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Dipyramidal
    Axial Ratios: a: 1.2414
    b: 1
    c: 2.0424
    Cell Dimensions: a: 10.54 Å
    b: 8.49 Å
    c: 17.34 Å
    Z: 4
    V: 1,551.66 Å3
    DenCalc: 3.70
    H-M Symbol: 2/m 2/m 2/m
    Space Group: Pnam
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 8.51 Å
    (0.8): 4.22 Å
    (0.6): 3.26 Å
    		Metatyuyamunite
    Crystal
    Habit:
  • Hexagonal plates
    		•   
    Cleavage:
    [001] Perfect
    [101] Distinct
    [100] Distinct
    		 
    Fracture:    
    Moh's
        Hardness:    		 2  
    Density: 3.8 - 3.9 grams/cm3
    Color: Greenish yellow  
    Streak: Light yellow  
    Luster: Subadamantine  
    Diaphaneity:    
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Autunite, Barite, Becquerelite, Calcite, Carnotite, Chalcocite, Chalcopyrite, Cuprosklodowskite, Goethite, Gypsum, Hematite, Hewettite, Jarosite, Malachite, Marcasite, Metatorbernite, Pyrite, Quartz, Roscoelite, Schröckingerite, Sphalerite, Tyuyamunite, Uraninite, Uranophane

    Mineral   -   > 65% of sites
    Mineral   -   > 50% of sites
    Mineral   -   > 25% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Metatyuyamunite
    Localities:

    Rare

    Metatyuyamunite localities
    Notes:

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

    Crystals are probably metamic.