From The Gemology Project
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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

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

Labradorite 45x incident.JPG