Lehnerite

 IMA-A 1986-032
Uranium 40.2a.16.2
(Dana Classification Number)
(No Images) 7/E.02-40
(Strunz ID)

Property Data Remarks
Named for: Ferdinand Lehner (1868 - 1943), German collector.
Alternate
    Name(s):
  • Lehnerit
  • Lehnerita
  • Lehnerite (of Mücke)
    		•   
    Mineral Class:
    Phosphates, Arsenates and Vanadates
      Uranylphosphates and uranylvanadates with
    [UO2]+2 - [PO4 | AsO4]-3 and
    [UO2]+2 - [V2O8]-6
        Meta-Autunite group
    		 
    Chemical
        Formula:    		 Mn3+(UO2)2(PO4)2 · 8H2O  
    Chemical
        Composition:
    Hydrogen: (H) 1.74%
    Manganese: (Mn) 5.91%
    Oxygen: (O) 34.44%
    Phosphorus: (P) 6.67%
    Uranium: (U) 51.24%
    		by weight
    Molecular
        Weight:    		 929.06 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    9.1721 × 1004 2.48 × 10-06 1.28 128.28

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Monoclinic - Prismatic
    Axial Ratios: a: 0.4102
    b: 1
    c: 0.405
    Cell Dimensions: a: 7.04 Å
    b: 17.16 Å
    c: 6.95 Å
    Z: 2
    b: 90.18°
    V: 839.60 Å3
    DenCalc: 3.67
    H-M Symbol: 2/m
    Space Group: P21/n
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 8.56 Å
    (0.8): 3.5 Å
    (0.7): 2.23 Å
    		 
    Habit:
  		•  
    Cleavage:
    [???] Perfect
    		 
    Fracture:    
    Moh's
        Hardness:    		 2 - 3  
    Density: 3.5 - 3.6 grams/cm3
    Color: Honey-yellow  
    Streak: White  
    Luster: Vitreous - Pearly  
    Diaphaneity: Transparent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Zoned granitic phosphate pegmatite worked mainly for feldspar
    		•   
    Associated
        Minerals:

    Albite, Arsenopyrite, Autunite, Bassetite, Beryl, Biotite, Bismite, Bismuth, Bismuthinite, Brazilianite, Brochantite, Calcite, Cassiterite, Chalcocite, Chalcopyrite, Chernikovite, Childrenite, 'Chlorite', Chrysocolla, 'Columbite', Copper, Cubanite, Cuprite, Digenite, Fluorite, Galena, Goethite, Graphite, Gypsum, Hematite, Ilmenite, Jarosite, Kaolinite, 'Limonite', Magnetite, Malachite, Marcasite, Meta-Autunite, Metatorbernite, Microcline, Molybdenite, Muscovite, 'Pitchblende', Pyrite, Pyrolusite, Pyrrhotite, Quartz var: Chalcedony, Rhodochrosite, Rockbridgeite, Samarskite, Siderite, Silver, Sphalerite, Sulphur, Torbernite, Turquoise, Uraninite, Uranophane, Uranpyrochlore, Vivianite, 'Wad', Wavellite, Wittichenite, Wolfeite, Xenotime-(Y), Zircon

    Minerals   -   Uranium & Thorium
    mineral links

    		These are a few minerals known to be found with Lehnerite
    Localities:

    Extremely rare

    Lehnerite Localities
    Notes:

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

    Crystals are probably metamic.

    Lehnerite is the Manganese analogue of Bassetite.