Labradorite
What is Labradorite?
Labradorite is a plagioclase feldspar that exhibits a schiller effect (iridescence) due to the diffraction of light from the microscopic inclusions within the stone. This phenomenon, known as labradorescence, causes flashes of iridescent colors, most commonly blues, greens, and golds, but also violets and reds, as the stone is turned. It is a gemstone valued for its beauty and is often used in jewelry and ornamental objects.
Optical Properties
- Refractive Index
- 1.560-1.572
- Birefringence
- 0.009
- Pleochroism
- Weak
- Optical Character
- Biaxial (-)
- Dispersion
- 0.016
Labradorite Market Value Calculator
Estimate the market value of Labradorite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Labradorite Localities Map
See where Labradorite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
More Images
© Lech Darski
© Prokofiev
Quick Facts
Physical Properties
- Color
- Gray, greenish-gray, blue, colorless, brown, yellow
- Hardness (Mohs)
- 6 to 6.5
- Density
- 2.69 to 2.76 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- (Ca,Na)(Al,Si)4O8
- Elements
- Silicon, Oxygen, Sodium, Calcium, Aluminum
Also Known As
Labrador sparSpectrolite
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