Cliffordite

 IMA-A 1966-046
Uranium 34.3.1.1
(Dana Classification Number)
(No Images) 4/K.14-20
(Strunz ID)

Property Data Remarks
Named for: Clifford Frondel, (1907 - 2002), American mineralogist
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Tellurides with [Te3O8]4- groups
        Winstanleyite - Cliffordite series
    		 
    Chemical
        Formula:    		 UTe3O9  
    Chemical
        Composition:
    Oxygen: (O) 18.83%
    Tellurium: (Te) 50.05%
    Uranium: (U) 31.12%
    		by weight
    Molecular
        Weight:    		 764.82 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    5.5708 × 1004 1.51 × 10-06 0.73 7.30

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Isometric - Diploidal
    Axial Ratios: a:  
    Cell Dimensions: a: 11.371 Å
    Z: 8
    V: 1,470.27 Å3
    DenCalc: 6.91
    H-M Symbol: 2m -3
    Space Group: Pa3
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.282 Å
    (0.31): 2.843 Å
    (0.28): 4.02 Å
    		 
    Habit:
  • Small (<0.5 mm) octahedral crystals
    		•   
    Cleavage:
    [001]  
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		 4  
    Density: 6.57 - 6.7 grams/cm3
    Color: Bright yellow to Sulfur yellow  
    Streak: Light yellow to bright yellow  
    Luster: Adamantine  
    Diaphaneity: Transparent to translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Azurite, Bambollaite, Barite, Burckhardtite, Caledonite, Carlfriesite, Chalcomenite, Chlorargyrite, Cuzticite, Denningite, Emmonsite, Eztlite, Goethite, Gold, Jarosite, Kuranakhite, Libethenite, Mackayite, Malachite, Moctezumite, Mroseite, Paratellurite, Poughite, Pseudomalachite, Pyrite, Quartz, Schmitterite, Sonoraite, Spiroffite, Tellurite, Tellurium, Tetrahedrite, Zemannite

    Mineral   -   > 100% of sites
    Mineral   -   > 60% of sites
    Mineral   -   > 40% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Cliffordite
    Localities:

    Very rare

    Cliffordite Localities
    Notes:

    Radioactive.