Derriksite

 IMA-A 1971-033
Uranium 34.7.5.1
(Dana Classification Number)
(No Images) 4/K.11-10
(Strunz ID)

Property Data Remarks
Named for: Joseph Derriks (1912 - 1992), Belgian geologist, who studied the uranium deposit of Shinkolobwe, Katanga, Democratic Republic of Congo.
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Uranyl-Selenides with [UO2]2+ - [SeO3]2- groups
        Derriksite - Demesmaekerite series
    		 
    Chemical
        Formula:    		 Cu4(UO2)(SeO3)2(OH)6  
    Chemical
        Composition:
    Copper: (Cu) 28.88%
    Hydrogen: (H) 0.69%
    Oxygen: (O) 25.45%
    Selenium: (Se) 17.94%
    Uranium: (U) 27.04%
    		by weight
    Molecular
        Weight:    		 880.17 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    4.8408 × 1004 1.31 × 10-06 0.68 67.85

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Pyramidal
    Axial Ratios: a: 0.2918
    b: 1
    c: 0.3125
    Cell Dimensions: a: 5.57 Å
    b: 19.088 Å
    c: 5.965 Å
    Z: 2
    V: 634.20 Å3
    DenCalc: 4.61
    H-M Symbol: mm2
    Space Group: Pn21m
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 4.78 Å
    (0.8): 3.748 Å
    (0.8): 4.072 Å
    		Derriksite
    Crystal
    Habit:
  		•  
    Cleavage:
    [???] Perfect
    [010] Good
    		 
    Fracture:    
    Moh's
        Hardness:    		    
    Density: 4.72 grams/cm3
    Color: Bottle-green  
    Streak:    
    Luster:    
    Diaphaneity: Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Azurite, Barite, Becquerelite, Brochantite, Cobaltoan Calcite, Carrollite, Chalcocite, Chalcomenite, Cobaltomenite, Cornetite, Covellite, Cuprosklodowskite, Curite, Demesmaekerite, Digenite, Francevillite, Gold, Guilleminite, Hematite, Heterogenite, Kasolite, Kolwezite, Malachite, Marthozite, Masuyite, Metatorbernite, Metatyuyamunite, Mottramite, Oosterboschite, Palladium, Rutherfordine, Schoepite, Sengierite, Sklodowskite, Soddyite, Sphaerocobaltite, Torbernite, Trogtalite, Tyuyamunite, Uraninite, Uranophane, Uranophane-beta, Vandenbrandeite, Vauquelinite, Wulfenite

    Minerals   -   Uranium & Thorium
    mineral links

    		 
    Localities:

    Extremely rare

    Derriksite Localities
    Notes:

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