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Geosciences LibreTexts

16.44: Kornerupine

  • Page ID
  • Kornerupine
    Chemical composition Complex borosilicate
    Crystal system Orthorhombic
    Habit Prismatic
    Cleavage Prismatic
    Fracture Conchoidal
    Hardness 6.5
    Optic nature Biaxial -
    Refractive index 1.67 -1.68
    Birefringence 0.013
    Dispersion Low, 0.019
    Specific gravity 3.28 - 3.35
    Lustre Vitreous
    Pleochroism Distinct (green, yellow, brown)


    Figure \(\PageIndex{1}\): Faceted Kornerupine
    Photo courtesy of The Gem Trader

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