Kahlerite

 IMA-GP
Uranium 40.2a.15.1
(Dana Classification Number)
(No Images) 7/E.01-50
(Strunz ID)
Unless sealed in glass, all specimens should be considered to have become Meta-Kahlerite within a few months of being exposed to ambient air.

Property Data Remarks
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-
        Autunite group
    		 
    Chemical
        Formula:    		 Fe+2(UO2)2(AsO4)2 · 10-12H2O  
    Chemical
        Composition:
    Arsenic: (As) 13.98%
    Hydrogen: (H) 2.07%
    Iron: (Fe) 5.21%
    Oxygen: (O) 34.33%
    Uranium: (U) 44.41%
    		by weight
    Molecular
        Weight:    		 1,071.91 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    7.9498 × 1004 2.15 × 10-06 1.12 11.19

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Tetragonal - Dipyramidal
    Axial Ratios: a: 1
    c: 1.53636
    Cell Dimensions: a: 14.3 Å
    c: 21.97 Å
    Z: 8
    V: 4,492.65 Å3
    DenCalc: 3.17
    H-M Symbol: 4/m
    Space Group: P42/n
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 3.53 Å
    (0.8): 11.1 Å
    (0.5): 5.55 Å
    		 
    Habit:
  • Flattened tablets
    		•   
    Cleavage:
    [001] Perfect
    [010]  
    [100]  
    		 
    Fracture:    
    Moh's
        Hardness:    		 2 - 3  
    Density:   grams/cm3
    Color: Lemon yellow  
    Streak: Light yellow to Yellowish-green  
    Luster: Vitreous  
    Diaphaneity: Transparent to Translucent  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:    		 Non-Fluorescent  
    Magnetism: Non-magnetic  
    Occurance:
  • Secondary uranium mineral in iron rich deposits
    		•   
    Associated
        Minerals:

    Aragonite, Arsenuranospathite, Autunite, Barite, Becquerelite, Bismuth, Bornite, Brochantite, Calcite, Chalcocite, Chalcopyrite, Chrysocolla, Coffinite, Copper, Cuprosklodowskite, Dewindtite, Dolomite, Erythrite, Galena, Goethite, Gypsum, Ianthinite, Johannite, Langite, Lavendulan, Liebigite, Löllingite, Malachite, Marcasite, Masuyite, Meta-Autunite, Meta-Uranopilite, Metakahlerite, Metalodevite, Metatorbernite, Metazeunerite, Mixite, Novácekite, Pyrite, Pyrolusite, Quartz, Rabejacite, Saléeite, Schoepite, Silver, Sklodowskite, Soddyite, Sphalerite, Tennantite, Torbernite, Uraninite, Uranophane, Uranophane-beta, Uranopilite, Vandendriesscheite, Wulfenite, Zeunerite, Zippeite

    Mineral   -   > 85% of sites
    Mineral   -   > 50% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Kahlerite
    Localities:

    Very rare

    Kahlerite Localities
    Notes:

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

    Crystals are probably metamic.

    Arsenate analog of Bassetite.