Labradorite is a feldspar gemstone known for displaying a stunning internal iridescence called “labradorescence,” a type of adularescence. This feature is sometimes called “schiller
- Color: Typically colorless, white, yellow, or gray; May show red, orange, yellow, green, blue, and violet color flashes of labradorescence
- Crystal structure: Triclinic
- Luster: Pearly or vitreous (glass-like)
- Transparency: Transparent to opaque
- Refractive index: 1.52-1.57
- Specific Gravity: 2.68-2.72
- Cleavage: Perfect in two directions
- Fracture: Uneven
- Streak: White
- Luminescence: May show fluorescence; red in SW-UV, light blue or violet-blue in LW-UV
- Pleochroism: Present and notable in Oregon labradorite
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