Metanovácekite

 IMA-GP
Uranium 40.2a.10.2
(Dana Classification Number)
(Images) 7/E.02-10
(Strunz ID)

Property Data Remarks
Named for: Being the meta- form of Novácekite, which is named for Radim Novácek (1905-1942), Czech minerologist
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:    		 Mg(UO2)2(AsO4)2 · 4-8H2O  
    Chemical
        Composition:
    Arsenic: (As) 15.77%
    Hydrogen: (H) 1.27%
    Magnesium: (Mg) 2.56%
    Oxygen: (O) 30.31%
    Uranium: (U) 50.10%
    		by weight
    Molecular
        Weight:    		 950.29 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    8.9672 × 1004 2.42 × 10-06 1.24 123.50

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Tetragonal - Dipyramidal
    Axial Ratios: a: 1
    c: 1.19832
    Cell Dimensions: a: 7.16 Å
    c: 8.58 Å
    Z: 1
    V: 439.86 Å3
    DenCalc: 3.59
    H-M Symbol: 4/m
    Space Group: P4/n
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 8.52 Å
    (0.9): 3.57 Å
    (0.6): 2.14 Å
    		 
    Habit:
  		•  
    Cleavage:
    [001] Perfect
    [010] Indistinct
    [110] Indistinct
    		 
    Fracture:    
    Moh's
        Hardness:    		 2.5  
    Density: 3.51 grams/cm3
    Color: Straw yellow to Pale yellow  
    Streak: Yellow white  
    Luster: Vitreous  
    Diaphaneity: Subopaque  
    Pleochroism:
    (x):  
    (y:)  
    (z:)  
    		 
    Ultra Violet
        Fluorescence:
    Long Wave: Yellowish green to greenish yellow
    Short Wave: Yellowish green to greenish yellow
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Acanthite, Aragonite, Arsenic, Arsenolite, Arsenopyrite, Barite, Bismuth, Bismuthinite, Brochantite, Calcite, Chalcopyrite, Copper, Dolomite, Erythrite, Fluorite, Galena, Goethite, Hematite, Kaolinite, Kasolite, Löllingite, Malachite, Marcasite, Metazeunerite, Mixite, Novácekite, Parasymplesite, 'Pitticite', Pyrite, Quartz, Safflorite, Silver, Skutterudite, Sphalerite, Tennantite, Tetrahedrite, Torbernite, Uraninite, Uranophane, Zeunerite

    Mineral   -   > 73% of sites
    Mineral   -   > 55% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Metanovácekite
    Locations:

    Very rare

    Metanovácekite Locations
    Notes:

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

    Crystals are probably metamict.

    Metanovácekite Images

    Specimen #1
    (001a)
    Serra das Éguas, Bahia, Northeast Region, Brazil

    Specimen Notes

    Occurrence -  

     

    Crystals -  

     

    Appearence -  

    Diaphaniety -

    Luster -

     

      -  

     

    Specimen Physical Properties
    Size   cm   cm   cm
    Weight: x grams    
    g-Radiation Level:   cmp   msieverts background: 20 cpm