Metahaiweeite

 IMA-Q
Uranium 53.3.2.3
(Dana Classification Number)
(See Haiweeite for images) 8/B.37-30
(Strunz ID)

Property Data Remarks
Named for: Haiwee Reservoir, Inyo County, California, USA, its type locality and its conversion to its meta- form
Alternate
    Name(s):
  • Ranquilite
  • meta-Haiweeite (alternative spelling)
    		•   
    Mineral Class:
    Silicates
      Nesosilicates with [Si2O7]-6,
    with anions unfamiliar to tetraheders [O,OH,F]
        Ursilite - Metahaiweeite series
    		 
    Chemical
        Formula:    		 Ca(UO2)2Si6O15(OH)2 · nH2O

            (n < 5)    		  
    Chemical
        Composition:
    Calcium: (Ca) 3.88%
    Hydrogen: (H) 0.49%
    Oxygen: (O) 33.28%
    Silicon: (Si) 16.30%
    Uranium: (U) 46.05%
    		by weight
    Molecular
        Weight:    		 1,033.68 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    8.2438 × 1004 2.23 × 10-06 1.16 116.12

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Prismatic
    Axial Ratios: a:  
    b:  
    c:  
    Cell Dimensions: a:   Å
    b:   Å
    c:   Å
    Z:  
    a:   °
    b:   °
    g:   °
    V:   Å3
    DenCalc:  
    H-M Symbol: 2/m
    Space Group: P2/c
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 6.98 Å
    (0.5): 5.85 Å
    (0.5): 8.81 Å
    		 
    Habit:
  • Microscopic Crystals
  • Spherical clusters
  • Aggregates of crystals
    		•   
    Cleavage:
    [001] Good
    [010]  
    [100] Distinct
    		 
    Fracture:    
    Moh's
        Hardness:    		 3.5.  
    Density: 3.35 grams/cm3
    Color: Greenish-yellow, Light yellow  
    Streak: White  
    Luster: Pearly  
    Diaphaneity: Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave: Dull green
    Short Wave: Dull green
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Dehydration product of Haiweeite
    		•   
    Associated
        Minerals:

    (See Haiweeite)

    		  
    Locations:

    Rare

    Metahaiweeite Locations
    Notes:

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