mineral
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
Hardness: 6-6.5 on Mohs scale; Color: Gray to dark gray with labradorescence (blue, green, gold flashes); Luster: Vitreous to pearly; Crystal System: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific Gravity: 2.68-2.72.
- Hardness
- 6-6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: Gray to dark gray with labradorescence (blue, green, gold flashes); Luster: Vitreous to pearly; Crystal System: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific Gravity: 2.68-2.72.
Formation & geological history
Formed in mafic igneous rocks such as basalt, gabbro, and norite, as well as in anorthosites. It crystallizes from cooling magma in the Earth's crust. Most specimens are from the Proterozoic Era.
Uses & applications
Predominantly used as a gemstone in jewelry, decorative carvings, and occasionally as a facing stone in architecture for its aesthetic appeal.
Geological facts
Labradorite is famous for its optical effect known as labradorescence, caused by internal lamellar structures that diffract light. Legend says it contains the Northern Lights (Aurora Borealis).
Field identification & locations
Identified by its distinctive schiller effect or 'flash' when rotated under light. Commonly found in Labrador (Canada), Madagascar, Finland, and Russia. Collectors should look for clean planes of cleavage and strong color play.
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Schist
Schist
Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock