Ursilite

Validity as a mineral species Pending		 IMA-GP
Uranium 51.0.0.0
(Dana Classification Number)
(No Images) 8/B.37-10
(Strunz ID)

Property Data Remarks
Named for: Its Uranium and Silicate content
Alternate
    Name(s):
  		•  
    Mineral Class:
    Silicates
      Nesosilicates with [Si2O7]-6,
    with anions unfamiliar to tetraheders [O,OH,F]
        Ursilite - Metahaiweeite series
    		 
    Chemical
        Formula:    		 (Mg,Ca)4[(UO2)4(OH)5/(Si2O5)5.5] · 13H2O  
    Chemical
        Composition:
    Calcium: (Ca) 1.77%
    Hydrogen: (H) 1.38%
    Magnesium: (Mg) 3.22%
    Oxygen: (O) 37.85%
    Silicon: (Si) 13.66%
    Uranium: (U) 42.11%
    		by weight
    Molecular
        Weight:    		 2,261.26 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    7.5369 × 1004 2.04 × 10-06 1.08 108.22

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic
    Axial Ratios: a:b:c = ::
    Cell Dimensions: a=, b=, c=, Z=; V= Den(Calc)=
    H-M Symbol:
    Space Group:
    X Ray Diffraction: By Intensity(I/Io): (1) () ()
    		 
    Habit:
  		•  
    Cleavage:
    [001]
    [010]
    [100]
    		 
    Fracture:    
    Moh's
        Hardness:    		 2 - 3  
    Density: 3.18 grams/cm3
    Color: Lemon yellow  
    Streak: Pale yellow  
    Luster:    
    Diaphaneity:    
    Pleochroism:
    (x):
    (y:)
    (z:)
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:
    Short Wave:
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    (None listed)

    		  
    Locations:

    Extremely rare

    No locations listed
    Notes:

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

    Crystals are probably metamic.