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16.10.02: Andesine

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    Andesine
    Chemical composition (Na,Ca)[Al(Si,Al)Si2O8]
    Crystal system Triclinic
    Habit Prismatic
    Cleavage Distinct to perfect
    Fracture Conchoidal
    Hardness 6.5
    Optic nature Biaxial +/-
    Refractive index 1.551 - 1.560
    Birefringence 0.009
    Specific gravity 2.67
    Lustre Sub-vitreous

    File:Andesine1.JPG

    Figure \(\PageIndex{1}\): Congolese andesine

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