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Geosciences LibreTexts

16.14.01: Liddicoatite

  • Page ID
    4342
  • Rubellite Tourmaline
    Chemical composition Complex Borosilicate
    Crystal system Trigonal
    Habit prismatic
    Cleavage none
    Fracture conchoidal
    Hardness 7.5
    Optic nature uniaxial -
    Refractive index 1.62 - 1.64
    Birefringence 0.014 - 0.022
    Dispersion low, 0.018
    Specific gravity 3.06
    Lustre Vitreous
    Pleochroism weak to strong

    A German Film on Crystal Structure of Madagascar Liddicoatite