Seelite-2

 IMA-1992-005
Uranium 46.2.9.1
(Dana Classification Number)
(No Images) 7/E.01-35
(Strunz ID)

Property Data Remarks
Named for: Paul and Hildegarde Seel, German collectors.
Alternate
    Name(s):
  		•  
    Mineral Class:
    Phosphates, Arsenates and Vanadates
      Uranylphosphates and uranylvanadates with
    [UO2]2+ - [PO4 | AsO4]3- and
    [UO2]2+ - [V2O8]6-
        Autunite group
    		 
    Chemical
        Composition:
    Arsenic: (As) 13.67%
    Hydrogen: (H) 2.57%
    Magnesium: (Mg) 4.43%
    Oxygen: (O) 35.90%
    Uranium: (U) 43.42%
    		by weight
    Molecular
        Weight:    		 548.16 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    7.7728 × 1004 2.10 × 10-06 1.11 110.73

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Prismatic
    Axial Ratios: a: 2.5781
    b: 1
    c: 0.9432
    Cell Dimensions: a: 18.207 Å
    b: 7.062 Å
    c: 6.661 Å
    Z: 3
    b: 99.65°
    V: 844.34 Å3
    DenCalc: 3.23
    H-M Symbol: 2/m
    Space Group: C2/m
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 9.05 Å
    (0.8): 1.92 Å
    (0.8): 4.44 Å
    		Seelite
    Crystal
    Habit:
  		•  
    Cleavage:
    [001]  
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		 3  
    Density: 3.7 grams/cm3
    Color: Yellow  
    Streak:    
    Luster: Vitreous - Glassy  
    Diaphaneity: Transparent to Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Oxidation zone of a Uranium deposit
    		•   
    Associated
        Minerals:

    Unknown

    		  
    Locations:

    Very rare

    See Seelite Locations
    Notes:

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

    Crystals are probably metamic.