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Geosciences LibreTexts

16.10.03: Labradorite

  • Page ID
    4290
  • Labradorite
    Chemical composition Plagioclase feldspar
    Crystal system Triclinic
    Habit Aggregates
    Hardness 5-5.5
    Optic nature Biaxial +
    Refractive index 1.559-1.570
    Birefringence 0.008-0.011
    Dispersion Low
    Specific gravity 2.70
    Lustre Vitreous

    Figure \(\PageIndex{1}\): Labradorite

    Microscopic image of labradorite taken at 45x magnification (ilmenite inclusions):

    Figure \(\PageIndex{2}\)