Pseudo-Autunite

 IMA-A
Uranium 40.2a.1.3
(Dana Classification Number)
(No Images) 7/E.02-180
(Strunz ID)

Property Data Remarks
Named for: Its similarity to autunite and meta-autunite in composition and occurrence
Alternate
    Name(s):
  		•  
    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:    		 (H3O)4Ca2(UO2)2(PO4)4 · 5H2O  
    Chemical
        Composition:
    Calcium: (Ca) 6.87%
    Hydrogen: (H) 1.90%
    Oxygen: (O) 39.78%
    Phosphorus: (P) 10.62%
    Uranium: (U) 40.82%
    		by weight
    Molecular
        Weight:    		 1,166.27 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    7.3066 × 1004 1.97 × 10-06 1.06 105.54

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic
    Axial Ratios: a: 1
    b: 1
    c: 1.8452
    Cell Dimensions: a: 6.964 Å
    b: 6.964 Å
    c: 12.85 Å
    Z: 1
    V: 623.19 Å3
    DenCalc: 3.11
    H-M Symbol:  
    Space Group:  
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.25 Å
    (1): 6.2 Å
    (0.9): 1.92 Å
    		 
    Habit:
  • Pseudo Hexagonal
  • Platy
    		•   
    Cleavage:
    [001]  
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		 2 - 3  
    Density: 3.28 grams/cm3
    Color: Pale yellow  
    Streak: White  
    Luster:    
    Diaphaneity:    
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave: Yellowish green
    Short Wave: Intense Yellowish green
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • Fissures and cavities of albite-acmite veins in the contact zone of ultrabasic-alkalic rocks
    		•   
    Associated
        Minerals:

    Albite, 'Amphibole Group', Ancylite-(Ce), Ankerite, 'Apatite', Bariopyrochlore, Barite, Beryl, Biotite, Bismuth, Brannerite, Calcite, Chalcopyrite, Copper, Diopside, Dolomite, Fluorapatite, Hydroxylbastnäsite-(Ce), Magnesite, Magnetite, Mckelveyite-(Y), Microcline, Monazite-(Ce), Muscovite, 'Olivine', Phlogopite, Pyrite, Pyrochlore, Pyrrhotite, Quartz, Rhodochrosite, 'Serpentine Group', Siderite, Spessartine, Sphalerite, Strontianite, Titanite, Uraninite, Vermiculite, Wittichenite, Yttrobetafite-(Y), Yttropyrochlore-(Y), Zircon, Zirconolite, Zirkelite

    Minerals   -   Uranium & Thorium
    mineral links

    		These are a few minerals known to be found with Pseudo-Autunite
    Locations:

    Extremely Rare

    Pseudo-Autunite Locations
    Notes:

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

    Crystals are probably metamic.