Ianthinite

 IMA-GP
Uranium 5.6.1.1
(Dana Classification Number)
(No Images) 5/F.05-10
(Strunz ID)

Property Data Remarks
Named for: For the Greek for violet, its color
Alternate
    Name(s):
  • Janthiniet
  • Janthinit
  • Lanthinite
  • Lanthinite (of Schoep)
  • Lanthite
  • Lianthinit
    		•   
    Mineral Class:
    Oxides
      Uranyl ([UO2]+2) hydroxides and hydrates
        Ianthinite - Paraschoepite series
    		 
    Chemical
        Formula:    		 (UO2)(UO3)5 · 10H2O  
    Chemical
        Composition:
    Hydrogen: (H) 0.66%
    Oxygen: (O) 21.05%
    Uranium: (U) 78.29%
    		by weight
    Molecular
        Weight:    		 304.04 daltons (amu)
    Specific
        Radioactivity:

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

    Specific Activity Dose Rate
    Becquerels Curies milliRems/hour microSieverts/hour
    1.40136 × 1005 3.79 × 10-06 1.82 18.18

    Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
    Crystalography:
    System: Orthorhombic - Pyramidal
    Axial Ratios: a: 0.6256
    b: 1
    c: 2.6488
    Cell Dimensions: a: 7.178 Å
    b: 11.473 Å
    c: 30.39 Å
    Z: 26
    V: 2,502.71 Å3
    DenCalc: 5.24
    H-M Symbol: mm2
    Space Group: P21cn
    X-Ray Diffraction:
      By Intensity ( I/Io )    		 (1): 7.63 Å
    (0.8): 3.24 Å
    (0.8): 3.81 Å
    		Ianthinite
    Crystal
    Habit:
  • Acicular
  • Granular
    		•   
    Cleavage:
    [001]  
    [010]  
    [100] Perfect
    		 
    Fracture: Uneven  
    Moh's
        Hardness:    		 2 - 2.5 - 3  
    Density: 5.16 grams/cm3
    Color: Violet-black to Black-violet  
    Streak: Violet brown  
    Luster: Sub-metallic  
    Diaphaneity: Transparent to translucent  
    Pleochroism:
    (x): Colorless
    (y:) Violet
    (z:) Dark violet
    		 
    Ultra Violet
        Fluorescence:
    Long Wave:  
    Short Wave:  
    		 
    Magnetism: Non-magnetic  
    Occurance:
  		•  
    Associated
        Minerals:

    Aragonite, Autunite, Azurite, Barite, Bassetite, Becquerelite, Billietite, Calcite, Cerussite, Chalcopyrite, Coffinite, Copper, Covellite, Curite, Dewindtite, Dolomite, Fluorite, Galena, Gypsum, Hematite, Kasolite, Malachite, Marcasite, Meta-autunite, Metatorbernite, Novácekite, Parsonsite, Phosphuranylite, Pyrite, Quartz, Rutherfordine, Saléeite, Schoepite, Sklodowskite, Sphalerite, Torbernite, Uraninite, Uraninite var: Pitchblende, Uranocircite, Uranophane, Uranophane-beta, Uranopilite, Wolsendorfite, Zeunerite, Zippeite

    Mineral   -   > 69% of sites
    Mineral   -   > 50% of sites
    Mineral   -   > 31% of sites
    Minerals   -   Uranium & Thorium
    mineral links

    		These are minerals known to be found with Ianthinite
    Localities:

    Rare

    Ianthinite Localities
    Notes:

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