Liandratite

 IMA-A 1975-039
Uranium  
(Dana Classification Number)
(No Images) 4/D.23-20
(Strunz ID)

Property Data Remarks
Named for: Georges Liandrat and his wife, of Samoens, France, who had prospected extensively in Madagascar
Alternate
    Name(s):
  		•  
    Mineral Class:
    Oxides
      Oxides with metal: [metal:oxygen = 1:2 (MO2 and related compounds)]
        Petscheckite - Liandratite series
    		 
    Chemical
        Formula:    		 U+6(Nb,Ta)2O8  
    Chemical
        Composition:
    Niobium: (Nb) 27.31%
    Oxygen: (O) 22.13%
    Tantalum: (Ta) 9.39%
    Uranium: (U) 41.16%
    		by weight
    Molecular
        Weight:    		 578.25 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    7.3683 × 1004 1.99 × 10-06 0.99 98.79

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Trigonal - Hexagonal Scalenohedral
    Axial Ratios: a: 1
    c: 0.6305
    Cell Dimensions: a: 6.36 Å
    c: 4.01 Å
    Z: 1
    V: 140.47 Å3
    DenCalc: 6.84
    H-M Symbol: -3 2/m
    Space Group: P-31m
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.18 Å
    (0.8): 4.01 Å
    (0.4): 2.49 Å
    		 
    Habit:
  • Encrustations
    		•   
    Cleavage: None  
    Fracture: Conchoidal  
    Moh's
        Hardness:    		 3.5  
    Density: 6.8 grams/cm3
    Color:    
    Streak: Yellow  
    Luster: Vitreous  
    Diaphaneity: Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Epitaxial crust on Petscheckite crystals, in pegmatite
    		•   
    Associated
        Minerals:

    Albite, Almandine, Anatase, Anhydrite, Ankerite, Barite, Bastnäsite-(Ce), Bavenite, Bertrandite, Beryl var: Aquamarine, Biotite, Boulangerite, Brookite, Calaverite, Calcite, Ceriopyrochlore-(Ce), Cheralite-(Ce), 'Chlorite', 'Columbite-Tantalite', Cookeite, Euclase, Eudialyte var: Eucolite, Fluorite, Galena, Gold, Grossular, Hematite, Hisingerite, Ilmenite, Ixiolite, Jamesonite, Lepidocrocite, Manganoan Calcite, Microcline, Microlite, 'Monazite', Muscovite, Opal var: Hyalite, 'Parisite', Petscheckite, Phenakite, Polycrase-(Y), 'Psilomelane', Quartz, Rutile var: Ilmenorutile, Sanidine, Siderite, Sphalerite, Stibiconite, Stilpnomelane, 'Synchysite', 'Tourmaline Group', Uranpyrochlore, Xenotime-(Y)

    Mineral   -   all of the sites
    Mineral   -   50% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Liandratite

    Petscheckite is always found with Liandratite
    Locations:

    Extremely rare

    Liandratite Locations
    Notes:

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

    Crystals are probably metamic.