Metakahlerite

 IMA-GP
Uranium 40.2a.15.2
(Dana Classification Number)
(No Images) 7/E.02-30
(Strunz ID)

Property Data Remarks
Named for: Being the meta- form of Kahlerite, which is named for Franz Kahler, Austrian geologist, Carinthian Landesmuseum, Klagenfurt, Austria
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:    		 Fe+2(UO2)2(AsO4)2 · 8H2O  
    Chemical
        Composition:
    Arsenic: (As) 14.72%
    Hydrogen: (H) 1.58%
    Iron: (Fe) 5.49%
    Oxygen: (O) 31.44%
    Uranium: (U) 46.77%
    		by weight
    Molecular
        Weight:    		 1,017.86 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    8.3719 × 1004 2.26 × 10-06 1.16 116.40

    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: 3.82
    H-M Symbol: 4/m 2/m 2/m
    Space Group: P4/mmm
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.59 Å
    (0.9): 8.55 Å
    (0.6): 4.29 Å
    		 
    Habit:
  		•  
    Cleavage:
    [001] Perfect
    [010]
    [100] Good
    		 
    Fracture:    
    Moh's
        Hardness:    		 2 - 3  
    Density: 3.48 grams/cm3
    Color: Sulphur yellow  
    Streak: Light yellow  
    Luster: Pearly  
    Diaphaneity: Transparent to Translucent  
    Pleochroism:
    (x):
    (y:)
    (z:)
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:
    Short Wave:
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Arsenopyrite, Arsenuranospathite, Billietite, Bismuth, Bornite, Brochantite, Calcite, Chalcocite, Chalcopyrite, Copper, Cornubite, Covellite, Galena, Hematite, Kasolite, Langite, Lavendulan, Malachite, Marcasite, Metaheinrichite, Metazeunerite, Nickeline, Novácekite, Pyrite, Safflorite, Silver, Sphalerite, Tennantite, Uraninite, Uranophane, Uranospinite, Vandendriesscheite, Zeunerite

    Mineral   -   > 86% of sites
    Mineral   -   > 71% of sites
    Mineral   -   > 57% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Metakahlerite
    Locations:

    Rare

    Metakahlerite Locations
    Notes:

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

    Crystals are probably metamic.