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Geosciences LibreTexts

16.07: Zoisite

  • Page ID
  • Zoisite
    Chemical composition Calcium aluminum silicate
    Crystal system Orthorhombic
    Habit Prismatic and massive
    Cleavage Perfect, prismatic
    Fracture Uneven
    Hardness 6.5
    Optic nature Biaxial +
    Refractive index 1.685-1.707
    Birefringence 0.008
    Dispersion Low, 0.012
    Specific gravity 3.35
    Lustre Vitreous
    Pleochroism Strong in blue

    Figure \(\PageIndex{1}\): Zoisite with ruby bead

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