Masuyite

 IMA-GP
Uranium 5.2.2.1
(Dana Classification Number)
(Images) 4/H.03-50
(Strunz ID)

Property Data Remarks
Named for: Gustave Masuy ( - 1945), Belgian geologist, shot by the Nazi occupiers at the end of World War II
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Uranyl ([UO2]+2) hydroxides and hydrates
        Fourmarierite - Masuyite series
    		 
    Chemical
        Formula:    		 Pb[(UO2)3O3(OH)2] · 3H2O  
    Chemical
        Composition:
    Hydrogen: (H) 0.70%
    Lead: (Pb) 17.97%
    Oxygen: (O) 19.42%
    Uranium: (U) 61.91%
    		by weight
    Molecular
        Weight:    		 1,153.34 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.10827 1005 3.00 10-06 1.44 143.82

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Domatic
    Axial Ratios: a: 1.7467
    b: 1
    c: 0.9964
    Cell Dimensions: a: 12.241 Å
    b: 7.008 Å
    c: 6.983 Å
    Z: 2
    b: 90.402°
    V: 599.02 Å3
    DenCalc: 6.39
    H-M Symbol: m
    Space Group: Pn
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 7.08 Å
    (0.7): 3.52 Å
    (0.5): 3.12 Å
    		Masuyite
    Crystal
    Habit:
  		•  
    Cleavage:
    [001] Perfect
    [010] Indistinct
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		    
    Density: 5.08 grams/cm3
    Color: Reddish orange, Carmine-red  
    Streak:    
    Luster: Vitreous  
    Diaphaneity: Transparent  
    Dichroism:
    (e): pale yellow
    (w): deep golden yellow
    		(Possible)
    Ultra Violet
        Fluorescence:    		 Non-fluorescent  
    Magnetism: Non-magnetic  
    Occurance:
  • Crystals lining cavities in uraninite
    		•   
    Associated
        Minerals:

    Aragonite, Arsenuranospathite, Autunite, Azurite, Barite, Becquerelite, Billietite, Calcite, Carrollite, Cerussite, Chalcocite, Chalcopyrite, Chrysocolla, Coffinite, Copper, Cuprosklodowskite, Curite, Dewindtite, Dolomite, Erythrite, Fourmarierite, Galena, Gypsum, Hematite, Ianthinite, Kahlerite, Kasolite, Liebigite, Malachite, Marcasite, Meta-Autunite, Metalodevite, Metatorbernite, Metazeunerite, Novácekite, Phosphuranylite, Pyrite, Quartz, Rabejacite, Rutherfordine, Saléeite, Schoepite, Sengierite, Sklodowskite, Soddyite, 'Sodium Uranospinite', Sphalerite, , Tetrahedrite, Torbernite, Tyuyamunite, Umohoite, Urancalcarite, Uraninite, Uranophane, Uranophane-beta, Uranopilite, Uranospinite, Vandenbrandeite, Vandendriesscheite, Wolsendorfite, Wulfenite, Wurtzite, Zellerite, Zeunerite, Zippeite

    Mineral   -   > 73% of sites
    Mineral   -   > 55% of sites
    Mineral   -   > 27% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Masuyite
    Locations:

    Rare

    Masuyite Locations
    Notes:

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

    Crystals are probably metamic.

    Masuyite Images

    Specimen #1
    (001a) (001b)

    w. Metatorbernite
    (showing evidence of pleochroism)
    Musonoi mine, Kolwezi, Shaba (Katanga), Congo (Zaïre)


    Specimen Notes

    Occurrence -  

     

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