Rabejacite

 IMA-A 1992-043
Uranium 31.6.8.1
(Dana Classification Number)
(No Images) 6/D.20-90
(Strunz ID)

Property Data Remarks
Named for: Rabéjac, Lodève, Hérault, Languedoc-Roussillon, France, its type locality
Alternate
    Name(s):
  		•  
    Mineral Class:
    Sulfates, Chromates, Molybdates and Tungstates
      Uranylsulfates [UO2]+2 - [SO4]-2
        Uranopilite - Rabejacite series
    		 
    Chemical
        Formula:    		 Ca(UO2)4(SO5)2(OH)6 . 6H2O  
    Chemical
        Composition:
    Calcium: (Ca) 2.63%
    Hydrogen: (H) 1.19%
    Oxygen: (O) 29.43%
    Sulfur: (S) 4.21%
    Uranium: (U) 62.54%
    		by weight
    Molecular
        Weight:    		 1,522.45 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.11944 × 1005 3.03 × 10-06 1.52 152.41

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic
    Axial Ratios: a: 0.5108
    b: 1
    c: 0.9198
    Cell Dimensions: a: 8.73 Å
    b: 17.09 Å
    c: 15.72 Å
    Z: 4
    V: 2,345.36 Å3
    DenCalc: 4.31
    H-M Symbol:  
    Space Group:  
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 7.9 Å
    (0.8): 3.49 Å
    (0.7): 3.38 Å
    		 
    Habit:
  • Acicular - crystals up to 3 mm
  • Nodular
  • Aggregates
  • Clusters
    		•   
    Cleavage: None  
    Fracture:    
    Moh's
        Hardness:    		 3  
    Density: 4.1 grams/cm3
    Color: Bright yellow to Brownish-yellow or Amber-yellow  
    Streak: White  
    Luster: Vitreous  
    Diaphaneity: Transparent to Translucent  
    Pleochroism:
    (x): Pale yellow
    (y:) Pale yellow
    (z:) Sulfur yellow
    		 
    Ultra Violet
        Fluorescence:
    Long Wave: Light yellow
    Short Wave: Light yellow
    		 
    Magnetism: Non-magnetic  
    Occurance:
  • An alteration product of pitchblende
    		•   
    Associated
        Minerals:

    Aragonite, Arsenuranospathite, Autunite, Azurite, Barite, Becquerelite, Calcite, Cerussite, Chalcopyrite, Copper, Dewindtite, Dolomite, Galena, Gypsum, Ianthinite, Kahlerite, Malachite, Marcasite, Masuyite, Meta-Autunite, Metalodevite, Metatorbernite, Metazeunerite, Novácekite, Pyrite, Quartz, Saléeite, Schoepite, 'Sodium Uranospinite', Sphalerite, Tetrahedrite, Torbernite, Uraninite, Uranophane, Uranophane-beta, Uranopilite, Uranospinite, Vandendriesscheite, Wulfenite, Wurtzite, Zellerite, Zeunerite, Zippeite,

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

    		These are minerals known to be found with Rabejacite
    Locations:

    Extremely rare

    Rabejacite Locations
    Notes:

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

    Crystals are probably metamict.