Labradorite

Labradorite is the plagioclase feldspar most commonly faceted as a gem. It occurs in yellow, orange, red, and colorless materials. But the stone that shows a play of color, or ‘schiller,’ is the most popular for use in jewelry. The schiller effect is due to the interference of light at junctions of internal structures. It is common to cut labradorite en cabochon.

Occurrence

Labradorite occurs in igneous and metamorphic rocks in Finland, Labrador (Canada), the former USSR, and Norway.

Labradorite Properties

• Specific Gravity: 2.70
• Refractive Index: 1.56-1.57
• Birefringence (DR): 0.010
• Luster: Vitreous
• Crystal Structure: Triclinic
• Composition: Sodium calcium aluminosilicate
• Hardness: 6

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Crystals Directory

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Birthstone

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