Larisaite

(name pending approval)		 IMA-2002-061
Uranium 60.1.3.4
(Dana Classification Number)
(Images) 8/EX.00-00
(Strunz ID)

Property Data Remarks
Named for: Larisa Nikolaevna Belova (1923-1998), Russian mineralogist, who made significant contributions to the knowledge of uranium minerals
Alternate
    Name(s):
  		•  
    Mineral Class:
    Chromates, Sulfates, Molybdates and Tungstates
      Unclassified Strunz Chromates, Sulfates, Molybdates and Tungstates
        Derriksite - Demesmaekerite series
    		Chemically related to Haynesite
    Chemical
        Formula:    		 Na(H3O)(UO2)3(SeO3)2O2 · 4H2O  
    Chemical
        Composition:
    Hydrogen: (H) 0.92%
    Oxygen: (O) 25.12%
    Selenium: (Se) 13.05%
    Sodium: (Na) 1.90%
    Uranium: (U) 59.01%
    		by weight
    Molecular
        Weight:    		 1,210.07 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.05631 × 1005 2.85 × 10-06 1.42 141.58

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Sphenoidal
    Axial Ratios: a: 0.4046
    b: 1
    c: 0.4432
    Cell Dimensions: a: 6.9806 Å
    b: 17.249 Å
    c: 7.646 Å
    Z: 2
    b: 90.039°
    V: 920.64 Å3
    DenCalc: 4.36
    H-M Symbol: 2
    Space Group: P11m
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 7.67 Å
    (0.77): 3.107 Å
    (0.53): 2.874 Å
    (0.43): 8.63 Å
    (0.4): 3.85 Å
    (0.33): 7.02 Å
    (0.3): 1.411 Å
    		Larisaite
    Crystal

    (Observed
    Approximation)
    Habit:
  • Tiny tabular or bladed crystals [Crystals are < 0.2 mm in length (one specimen examined)]
  • Radial clusters, with crystals much less ordered than with Haynesite
  • Chemically related to Haynesite
    		•   
    Cleavage:
    [001]  
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		    
    Density:   grams/cm3
    Color: Yellow to Yellow green  
    Streak:    
    Luster: Vitreous  
    Diaphaneity: Transparent to Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave: Non-fluorescent
    Short Wave: Green (weak)
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • On crack surface in mudstone
    		•   
    Associated
        Minerals:

    Andersonite, Boltwoodite, Ferroselite, Haynesite, Gypsum, Marcasite, Selenium, Uraninite

    Mineral   -   Important Associates
    Mineral   -   Also found at that location
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Larisaite
    Locations:

    Extremely rare

    Larisaite Locations
    Notes:

    Radioactive a- and b-particles, g-rays.

    Larisaite may be considered to be Haynesite with Sodium Hydroxide (NaOH) added.

    Larisaite Images

    Specimen
    (001a) (001b)
    Repete Mine, Blanding, San Juan Co., Utah, U.S.A.

    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