Lapis Lazuli Facts

    Lapis Lazuli Facts

    Lapis Lazuli Facts

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    Lapis Lazuli Facts

     

    Chemical CompositionIt is a rock composed of  Lazurite (Na,CA)8(AlSiO4)6(SO4,S,Cl)2 , Hauynite (Na,CA)4-8(AlSiO4)6(SO4)1-2 , Sodalite Na8(AlSiO4)6Cl2 , Noselite Na8(AlSiO4)6SO4 , Calcite CaCO3 and Pyrite FeS2.
    ColoursIntense deep blue with pyrite inclusions. Sometimes white coloured calcite lines also present. Other possible colour shades – purplish blue, greenish blue.
    HardnessVaries between 5-6 ( Mohs) .
    Refractive IndexApproximately 1.50
    Specific GravityIt varies between 2.7 to 2.9 and increases with the increase of pyrite content.
    LusterGreasy.
    Solid StateOpaque
    Crystal SystemNone as it is a rock.
    PleochroismNone
    PhenomenaNone
    FracturesUneven
    EnhancementFrequently enhanced to improve the colour and durability by dying and impregnated.
    SourceAfghanistan, Chile, Siberia, United States, Burma, Canada, Russia, Italy, Mongolia and Pakistan.
    PrecautionsProtect from sunlight, large temperature changes, cosmetics, harsh household cleaning products.
    admin March 9, 2016 Lapis Lazuli