Fourmarierite

 IMA-GP
Uranium 5.9.2.1
(Dana Classification Number)
(No Images) 4/H.07-10
(Strunz ID)


Paul Fourmarier
(1877-1970)

Property Data Remarks
Named for: Paul Fourmarier (1877-1970), Belgian geologist, and Professor of Geology at the University of Liege, Belgium
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Uranyl ([UO2]2+) hydroxides and hydrates
        Fourmarierite - Masuyite series
    		 
    Chemical
        Formula:    		 Pb(UO2)4O3(OH)4 · 4H2O  
    Chemical
        Composition:
    Hydrogen: (H) 0.82%
    Lead: (Pb) 14.04%
    Oxygen: (O) 20.60%
    Uranium: (U) 64.53%
    		by weight
    Molecular
        Weight:    		 1,475.40 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.15514 × 1005 3.12 × 10-06 1.51 15.05

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Pyramidal
    Axial Ratios: a: 0.8528
    b: 1
    c: 0.8715
    Cell Dimensions: a: 13.986 Å
    b: 16.4 Å
    c: 14.293 Å
    Z: 8
    a:   °
    b:   °
    g:   °
    V: 3,278.39 Å3
    DenCalc: 5.98
    H-M Symbol: mm2
    Space Group: Bb21m
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 7.2 Å
    (0.5): 3.18 Å
    (0.5): 3.58 Å
    		Fourmarierite
    Crystal
    Habit:
  • Tabular crystals to 3mm length
  • Pseudo hexagonal
    		•   
    Cleavage:
    [001] Perfect
    [010]  
    [100] Indistinct
    		 
    Fracture:    
    Moh's
        Hardness:    		 3 - 4  
    Density: 5.74 - 6.05 grams/cm3
    Color: Red, Carmine red, Pink orange, Reddish orange, Reddish brown or Brown  
    Streak: Orange  
    Luster: Adamantine  
    Diaphaneity: Transparent to translucent  
    Pleochroism:
    (x): Colorless
    (y:) Pale amber yellow
    (z:) Amber yellow
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Secondary mineral from uraninite and lead minerals(s)
    		•   
    Associated
        Minerals:

    Autunite, Becquerelite, Bismuth, Bornite, Calcite, Cassiterite, Chalcopyrite, Copper, Curite, Dewindtite, Fluorapatite, Fluorite, Galena, Hematite, Kasolite, Lepidolite, Malachite, Meta-Autunite, Metatorbernite, Microcline, Molybdenite, Montmorillonite, Muscovite, Parsonsite, Phosphuranylite, Pitchblende, Pyrite, Pyrrhotite, Quartz, Quartz var: Smoky Quartz, Sklodowskite, Sphalerite, Torbernite, Uraninite, Uranophane, Uranophane-beta, Uranopilite, Vandendriesscheite, Wolsendorfite, Zippeite, Zircon

    Mineral   -   > 67% of sites
    Mineral   -   > 50% of sites
    Mineral   -   > 27% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Fourmarierite
    Localities:

    Rare

    Fourmarierite Localities
    Notes:

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

    Crystals are probably metamict.