Andalusite Facts

    Andalusite Facts

    Andalusite Facts

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    Andalusite Properties

    Chemical CompositionIt is aluminum silicate having the chemical formula Al2 SiO5.
    ColoursDifferent shades of brown and green. Other colours are red, gray, orange and pink.
    LusterVitreous to glassy.
    HardnessVaries between 6.5- 7.5.
    Specific Gravity3.1 to 3.2
    Refractive Index1.632-1.650
    Solid StateTransparent to translucent.
    Crystal SystemOrthorhombic crystal system.
    PleochroismVery strong.
    FracturesUneven to sub conchoidal.
    EnhancementIt is sometimes enhance to improve the colour.
    SourceBrazil, Sri Lanka, UK, Spain, Australia, United States, India, Russia and China.
    PrecautionsNeeds only general gemstone precautions, nothing specific.
    admin March 9, 2016 Andalusite