Sengierite

 IMA-GP
Uranium 42.6.10.1
(Dana Classification Number)
(No Images) 7/E.11-30
(Strunz ID)

Property Data Remarks
Named for: Edgar Sengier (1879-1963), Manager of the Société Générale de Belgique and the Union Minère du Haut Katanga.
Alternate
    Name(s):
  		•  
    Mineral Class:
    Phosphates, Arsenates and Vanadates
      Uranylphosphates and uranylvanadates with:
    [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-,
    uranyl-group vanadates with [UO2]2+ - [V2O8]6-
        Tyuyamunite series
    		 
    Chemical
        Formula:    		 Cu2(UO2)2V2O8 · 6H2O  
    Chemical
        Composition:
    Copper: (Cu) 12.64%
    Hydrogen: (H) 1.20%
    Oxygen: (O) 28.65%
    Uranium: (U) 47.36%
    Vanadium: (V) 10.14%
    		by weight
    Molecular
        Weight:    		 1,005.12 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    8.4780 × 1004 2.29 × 10-06 1.17 117.26

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Prismatic
    Axial Ratios: a: 1.1904
    b: 1
    c: 1.1327
    Cell Dimensions: a: 10.599 Å
    b: 8.903 Å
    c: 10.085 Å
    Z: 2
    b: 103.42°
    V: 925.66 Å3
    DenCalc: 3.61
    H-M Symbol: 2/m
    Space Group: P21/a
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 9.81 Å
    (0.43): 4.905 Å
    (0.19): 3.218 Å
    		Sengierite
    Crystal
    Habit:
  • Prismatic crystals
  • Blocky crystals
    		•   
    Cleavage:
    [001] Perfect
    [010]  
    [100]  
    		 
    Fracture: Brittle  
    Moh's
        Hardness:    		 2.5  
    Density: 4.05 - 4.41 grams/cm3
    Color: Green, Yellowish green  
    Streak: Light green  
    Luster: Vitreous - Adamantine  
    Diaphaneity: Transparent  
    Pleochroism:
    (x): Blue green
    (y:) Olive green
    (z:) Yellow green
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
    • Secondary mineral from Uraninite in areas of black oxides of copper, iron, nickel and cobalt
    		  
    Associated
        Minerals:

    Aragonite, Azurite, Barite, Becquerelite, Billietite, Bornite, Brochantite, Calcite, Carrollite, Chalcocite, Chalcopyrite, Chrysocolla, Cobaltoan Calcite, Conichalcite, Copper, Covellite, Cuprosklodowskite, Curite, Digenite, Dioptase, Galena, Goethite, Gold, Graphite, Guilleminite, Gypsum, Hematite, Ianthinite, Kasolite, Liebigite, Malachite, Masuyite, Metatorbernite, Molybdenite, Mottramite, Pharmacosiderite, Pyrite, Pyrolusite, Rutherfordine, Saléeite, Scheelite, Schoepite, Silver, Sklodowskite, Soddyite, Sphalerite, Stromeyerite, Studtite, Torbernite, Tyuyamunite, Umohoite, Urancalcarite, Uraninite, Uranophane, Uranophane-beta, Vandenbrandeite, Vandendriesscheite, Wulfenite, Zippeite

    Mineral   -   > 67% of sites
    Mineral   -   > 33% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Sengierite
    Locations:

    Very rare

    Sengierite Locations
    Notes:

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

    Crystals are probably metamic.