Metakirchheimerite

 IMA-GP
Uranium 40.2a.17.1
(Dana Classification Number)
(No Images) 7/E.02-50
(Strunz ID)

Property Data Remarks
Named for: Franz Waldemar Kirchheimer (1911- ), director of the Geologische Landesamt Baden-Wurttemberg.
Alternate
    Name(s):
  • Metakirchheimerit
  • Metakirchheimerita
  • Metakirchheimerite
    		•   
    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:    		 Co(UO2)2(AsO4)2 · 8H2O  
    Chemical
        Composition:
    Arsenic: (As) 14.68%
    Cobalt: (Co) 5.77%
    Hydrogen: (H) 1.58%
    Oxygen: (O) 31.34%
    Uranium: (U) 46.63%
    		by weight
    Molecular
        Weight:    		 1,020.95 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    8.3466 × 1004 2.26 × 10-06 1.16 115.96

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Tetragonal - Ditetragonal Dipyramidal
    Axial Ratios: a: 1
    c: 1.19498
    Cell Dimensions: a: 7.18 Å
    c: 8.58 Å
    Z: 1
    V: 442.32 Å3
    DenCalc: 3.83
    H-M Symbol: 4/m 2/m 2/m
    Space Group: P4/mmm
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.56 Å
    (1): 8.55 Å
    (0.6): 5.07 Å
    		 
    Habit:
  		•  
    Cleavage:
    [001] Perfect
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		 2 - 2.5  
    Density: 3.2 - 3.25 grams/cm3
    Color: Pale pink  
    Streak: White  
    Luster: Pearly  
    Diaphaneity: Transparent to Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Aragonite, Azurite, Barite, Calcite, Chalcopyrite, Dolomite, Galena, Gypsum, Heinrichite, Malachite, Metaheinrichite, Metazeunerite, Novácekite, Pyrite, Sphalerite, Uraninite, Zeunerite

    Mineral   -   All of the sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Metakirchheimerite
    Locations:

    Very rare

    Meta-Kirchheimerite Locations
    Notes:

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

    Crystals are probably metamic.