Chadwickite

 IMA-A 1997-005
Uranium 45.1.15.1
(Dana Classification Number)
(No Images) 4/J.05-10
(Strunz ID)


Sir James Chadwick

Property Data Remarks
Named for: Sir James Chadwick (1891-1974), English physicist Cavendish Laboratory, University of Cambridge, U.K. 1935 Nobel Prize winner for his discovery of the neutron
Alternate
    Name(s):
  • Chadwickit
  • Chadwickita
    		•   
    Mineral Class:
    Oxides & Hydroxides
      Arsenides with [AsO3]3- groups
        Asbeckasite - Cafarsite series
    		 
    Chemical
        Formula:    		 (UO2)H(AsO3)  
    Chemical
        Composition:
    Arsenic: (As) 19.02%
    Hydrogen: (H) 0.26%
    Oxygen: (O) 20.31%
    Uranium: (U) 60.42%
    		by weight
    Molecular
        Weight:    		 393.96 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.08152 × 1005 2.92 × 10-06 1.43 142.69

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Tetragonal
    Axial Ratios: a: 1
    c: 1.4509
    Cell Dimensions: a: 11 Å
    c: 15.96 Å
    Z: 14
    V: 1,931.16 Å3
    DenCalc: 4.74
    H-M Symbol:   -
    Space Group:   -
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 4.95 Å
    (0.8): 3.33 Å
    (0.8): 5.58 Å
    		 
    Habit:
  • Encrustations
    		•   
    Cleavage:
    [001] Perfect
    [010]  
    [100]  
    		 
    Fracture: Uneven  
    Moh's
        Hardness:    		 2  
    Density: 4.86 grams/cm3
    Color: Yellow  
    Streak: Yellow  
    Luster: Earthy  
    Diaphaneity: Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • From granite in dump material at the Sophia mine, central Black Forest
    		•   
    Associated
        Minerals:

    Aragonite, Arsenic, Arsenopyrite, Arsenuranospathite, Azurite, Barite, Billietite, Bismite, Bismuth, Bismuthinite, Bismutite, Bornite, Calcite, Chalcopyrite, Chlorargyrite, Chrysocolla, Cinnabar, Cobaltkoritnigite, Copper, Cuprite, Dolomite, Fluorite, Galena, Gypsum var: Selenite, Heinrichite, Hematite, Kaolinite, Kasolite, Lautite, Löllingite, Malachite, Metaheinrichite, Metakahlerite, Metakirchheimerite, Metanovácekite, Metazeunerite, Mimetite, Muscovite, Nickeline, Novácekite, Olivenite, Orpiment, Pyrite, Pyrolusite, Quartz, Realgar, Rutherfordine, Rutile, Siderite, Silver, Sphalerite, Uraninite, Uranophane, Uranospinite, Vandendriesscheite, Walpurgite, Wittichenite, Wolsendorfite, Xenotime-(Y), Zeunerite

    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Chadwickite
    Localities:

    Extremely rare

    Chadwickite Localities
    Notes:

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

    Crystals are probably metamic.