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
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Labradorite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Labradorite Localities Map
See where Labradorite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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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
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Labradorite FAQs
How do I identify Labradorite?
Labradorite can be identified by its hardness of 6 to 6.5 on the Mohs scale, Gray color. Look for these key characteristics when examining specimens.
What color is Labradorite?
Labradorite typically appears in Gray, greenish-gray, blue, colorless, brown, yellow. Color can vary depending on impurities and formation conditions.
How hard is Labradorite?
Labradorite has a hardness of 6 to 6.5 on the Mohs scale. This gives it moderate hardness.