Marthozite

 IMA-A 1968-016
Uranium 34.7.4.1
(Dana Classification Number)
(Images) 4/K.11-20
(Strunz ID)

Property Data Remarks
Named for: Aime Marthoz (1864-1962), French mineralogist and Inspector General, Bureau de Recherches Geolgiques et Miniere, and Belgian General Manager of the Union minière du Haut-Katanga
Alternate
    Name(s):
  • Marthosite
    		•   
    Mineral Class:
    Oxides
      Uranyl-Selenides with [UO2]+2 - [SeO3]-2 groups
        Derriksite - Demesmaekerite series
    		 
    Chemical
        Formula:    		 Cu[(UO2)3(SeO3)2O2] · 7-8H2O  
    Chemical
        Composition:
    Copper: (Cu) 4.87%
    Hydrogen: (H) 1.24%
    Oxygen: (O) 27.00%
    Selenium: (Se) 12.11%
    Uranium: (U) 54.78%
    		by weight
    Molecular
        Weight:    		 1303.67 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    9.8048 × 1004 2.65 × 10-06 1.33 133.05

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Pyramidal
    Axial Ratios: a: 0.4247
    b: 1
    c: 1.0467
    Cell Dimensions: a: 6.9879 Å
    b: 16.4537 Å
    c: 17.2229 Å
    Z: 4
    V: 1,980.23 Å3
    DenCalc: 4.37
    H-M Symbol: mm2
    Space Group: Pbn21
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.09 Å
    (1): 8.23 Å
    (0.8): 3.22 Å
    		Marthozite
    Crystal

    (observed)
    Habit:
  • Bladed crystal aggregates, crystals up to 3 mm
    		•   
    Cleavage:
    [001]  
    [010] Indistinct
    [100] Perfect
    		 
    Fracture: Brittle (One Specimen Examined)
    Moh's
        Hardness:    		 6  
    Density: 4.44 grams/cm3
    Color: Yellowish green, Brown  
    Streak:    
    Luster: Vitreous, Resinous  
    Diaphaneity: Opaque to Sub-translucent  
    Pleochroism:
    (x): Yellowish brown
    (y:) Greenish yellow
    (z:) Greenish yellow
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Cavities in selenian digenite
    		•   
    Associated
        Minerals:

    Becquerelite, Calcite, Hematite, Kasolite, Malachite, Masuyite, Metatorbernite, Uraninite, Uranophane

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found at both Marthozite locations
    Locations:

    Rare

    Marthozite Locations
    Notes:

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

    Crystals are probably metamic.

    May be subject to dehydration to a meta- form.

    Marthozite Images

    Specimen #1
    (001a) (001b) (001c) (001d)

    (w. Sklodowskite)
    Musonoi mine, Kolwezi, Shaba (Katanga), Congo (Zaïre)

    Specimen Notes

    Occurrence -  

     

    Crystals -  

     

    Appearence -  

    Diaphaniety -

    Luster -

     

      -  

     

    Specimen Physical Properties
    Size   cm   cm   cm
    Weight: x grams    
    g-Radiation Level:   cmp   msieverts background: 20 cpm