Haiweeite

 IMA-GP
Uranium 53.3.2.2
(Dana Classification Number)
(Images) 8/B.37-20
(Strunz ID)
Unless sealed in glass, all specimens should be considered to have become Metahaiweeite within a few months of being exposed to ambient air.

Property Data Remarks
Named for: Haiwee Reservoir, Inyo County, California, USA, its type locality
Alternate
    Name(s):
  • Haiweeit
  • Haiweeita
  • Ranquilit
  • Ranquilita
  • Ranquilite
    		•   
    Mineral Class:
    Silicates
      Nesosilicates
    "Insel" silicates with anions unfamiliar to tetraheders.
    Uranyl-"Insel" silicates with [UO2]2+ - [SiO4]4-
        Ursilite - Metahaiweeite series
    		 
    Chemical
        Formula:    		 Ca[(UO2)2Si5O12(OH)2] · 3H2O  
    Chemical
        Composition:
    Calcium: (Ca) 4.01%
    Hydrogen: (H) 0.81%
    Oxygen: (O) 33.58%
    Silicon: (Si) 14.03%
    Uranium: (U) 47.58%
    		by weight
    Molecular
        Weight:    		 1,000.61 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    8.5162 × 1004 2.30 × 10-06 1.20 119.92

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Dipyramidal
    Axial Ratios: a: 0.3972
    b: 1
    c: 1.0225
    Cell Dimensions: a: 7.125 Å
    b: 17.937 Å
    c: 18.342 Å
    Z: 4
    V: 2,344.13 Å3
    DenCalc: 2.84
    H-M Symbol: 2/m 2/m 2/m
    Space Group: Cmcm
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 9.14 Å
    (0.6): 4.42 Å
    (0.6): 4.556 Å
    		 
    Habit:
  • Microscopic acicular crystals
  • Spherical, nearly botytoidal, clusters
  • Aggregates of crystals
  • Lone crystals not observed
    		•   
    Cleavage:
    [001] Good
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		 3.5  
    Density: 2.86 - 3.35 grams/cm3
    Color: Pale yellow, Greenish-yellow, White  
    Streak: White  
    Luster: Pearly  
    Diaphaneity:    
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave: Yellowish Green (weak)
    Short Wave: Greenish Yellow (moderately stong)

    Close-packed clusters are less fluorescent than open clusters

    Terminations appear to be more fluorescent than the crystal body

    		 (One Specimen Examined)
    Magnetism: Non-magnetic  
    Occurance:
  • Secondary oxidation product
    		•   
    Associated
        Minerals:

    Aegirine, Albite, Astrophyllite, Autunite, Beryl var: Aquamarine, Betafite, Biotite, Calcite, Chernikovite, Chrysoberyl, Diopside, Ekanite, Fluorapatite, Fluorite, Galena, Ianthinite, Meta-Autunite, Metatorbernite, Microcline, Muscovite, Nepheline, Neptunite, Phosphuranylite, Pyrochlore, Quartz, Quartz var: Rutilated Quartz, Quartz var: Smoky Quartz, Rutile, Schorl, Sphalerite, Steacyite, Titanite, Topaz, 'Tourmaline Group', Turkestanite, Uranocircite, Uranophane, Uranophane-beta

    Mineral   -   > 40% of sites
    Mineral   -   > 20% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Haiweeite
    Locality:

    Very rare

    Haiweeite Localities
    Notes:

     

    Haiweeite Images

    Specimen Top
    (001a) (001b) (001c) (001d)
    (001e)
    Teofilo Otoni, Minas Gerais, Brazil

    Specimen Notes

    Occurrence -  

     

    Crystals -  

     

    Appearence -  

    Diaphaniety -

    Luster -

     

      -  

     

    Specimen Physical Properties
    Size   cm   cm   cm
    Weight: x grams    
    g-Radiation Level:   cmp   msieverts background: 20 cpm