Dewindtite

 IMA-GP
Uranium 42.9.8.1
(Dana Classification Number)
(Images) 7/E.07-80
(Strunz ID)

Property Data Remarks
Named for: Jean Dewindt, Belgian geologist
Alternate
    Name(s):
  • (also see Renardite)
  • Stasite
    		•   
    Mineral Class:
    Phosphates, Arsenates and Vanadates
      Uranylphosphates and uranylvanadates with
    [UO2]+2 - [PO4 | AsO4]-3 and
    [UO2]+2 - [V2O8]-6
        Phosphuranylite series
    		 
    Chemical
        Formula:    		 Pb3[H(UO2)3O2(PO4)2]2 · 12H2O  
    Chemical
        Composition:
    Hydrogen: (H) 0.90%
    Lead: (Pb) 21.41%
    Oxygen: (O) 24.24%
    Phosphorus: (P) 4.27%
    Uranium: (U) 49.18%
    		by weight
    Molecular
        Weight:    		 2,903.85 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    8.8036 × 1004 2.38 × 10-06 1.17 11.73

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Dipyramidal
    Axial Ratios: a: 0.9285
    b: 1
    c: 0.788
    Cell Dimensions: a: 16.031 Å
    b: 17.264 Å
    c: 13.605 Å
    Z: 4
    V: 3,765.31 Å3
    DenCalc: 5.12
    H-M Symbol: 2/m 2/m 2/m
    Space Group: Bmmb
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 5.89 Å
    (1): 8.01 Å
    (0.9): 3.14 Å
    		 
    Habit:
  • Tabular
  • Striated faces
  • Pulverulent masses or coatings
    		•   
    Cleavage:
    [001]  
    [010]  
    [100] Perfect
    		 
    Fracture: Brittle  
    Moh's
        Hardness:    		 2.5 - 3  
    Density: 5.03 grams/cm3
    Color: Greenish yellow  
    Streak: Light to pale Yellow  
    Luster:    
    Diaphaneity: Translucent  
    Pleochroism:
    (x): Colorless
    (y:) Golden yellow
    (z:) Golden yellow
    		 
    Ultra Violet
        Fluorescence:
    Long Wave: Green
    Short Wave: Green
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • secondary mineral formed by alteration of uraninite or earlier U-bearing minerals
    		•   
    Associated
        Minerals:

    Arsenopyrite, Autunite, Barite, Becquerelite, Billietite, Calcite, Cerussite, Chalcocite, Chalcopyrite, Coffinite, Copper, Covellite, Curite, Fourmarierite, Galena, Hematite, Ianthinite, Johannite, Kasolite, 'Limonite', Malachite, Marcasite, Metatorbernite, Parsonsite, Phosphuranylite, Pitchblende, Pyrite, Quartz, Saléeite, Schoepite, Sklodowskite, Sphalerite, Torbernite, Uraninite, Uranocircite, Uranophane, Uranophane-beta, Uranopilite, Vandendriesscheite, Wolsendorfite, Wulfenite, Zeunerite, Zippeite

    Mineral   -   > 42% of sites
    Mineral   -   > 17% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Dewindtite
    Localities:

    Rare

    Dewindtite Localities
    Notes:

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

    Dewindtite Images

    Specimen #1
    (001a) (001b)
    Les Bois-Noirs Mine (Mine des Bois-Noirs), Loire, Rhône-Alpes, France


    Specimen Notes

    Occurrence -  

     

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