Wyartite

 IMA-GP
Uranium 16b.7.4.1
(Dana Classification Number)
(No Images) 5/F.05-10
(Strunz ID)

Property Data Remarks
Named for: Jean Wyart (1902-1992), mineralogist at the Sorbonne, Paris
Alternate
    Name(s):
  		•  
    Mineral Class: Nitrates, Carbonates & Borates -
    - Wyartite series    		  
    Chemical
        Formula:    		 Ca3U+4(UO2)6(CO3)2(OH)18 · 3-5H2O  
    Chemical
        Composition:
    Calcium: (Ca) 4.89%
    Carbon: (C) 0.98%
    Hydrogen: (H) 0.98%
    Oxygen: (O) 25.38%
    Uranium: (U) 67.77%
    		by weight
    Molecular
        Weight:    		 2,458.63 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.21308 × 1005 3.28 × 10-06 1.63 162.52

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Disphenoidal
    Axial Ratios: a:b:c = 1.5889:1:2.9632
    Cell Dimensions: a = 11.25, b = 7.08, c = 20.98, Z = 2; V = 1,671.06 Den(Calc)= 4.89
    H-M Symbol: 2 2 2
    Space Group: P212121
    X Ray Diffraction: By Intensity(I/Io): 8.46(1) 3.47(0.2) 4.22(0.18)
    		 
    Habit:
  • Platy
  		•   
    Cleavage:
    [001] Perfect
    [010] Perfect
    [100]
    		 
    Fracture:    
    Moh's
        Hardness:    		 3 - 4  
    Density: 4.69 grams/cm3
    Color: Black, Violet-black  
    Streak: Brownish violet  
    Luster: Vitreous - Dull  
    Diaphaneity: Translucent to Opaque  
    Pleochroism:
    (x): Gray
    (y): Violet
    (z): Lavender blue
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:
    Short Wave:
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Alteration product of red rims around uraninite
  		•   
    Associated
        Minerals:

    Becquerelite, Curite, Dewindtite, Dumontite, Ianthinite, Kasolite, Metatorbernite, Parsonsite, Phosphuranylite, Saléeite, Schoepite, Torbernite, Uraninite, Uranophane, Vandendriesscheite

    Mineral   -   > 67% of sites
    Mineral   -   > 50% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Wyartite
    Locations:

    Very rare

    Wyartite Locations
    Notes:

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

    Crystals are probably metamic.