mineral
Polished labradorite cabochon
Labradorite, CaAl₂Si₂O₈–NaAlSi₃O₈ (feldspar solid solution)
AI-generated identification · may be incorrectTypically gray-green to blue-gray with glassy luster and distinctive blue-green iridescent flashes (labradorescence); Mohs hardness 6–6.5, triclinic crystal structure, two cleavage directions, and specific gravity about 2.68–2.72.
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Physical properties
Typically gray-green to blue-gray with glassy luster and distinctive blue-green iridescent flashes (labradorescence); Mohs hardness 6–6.5, triclinic crystal structure, two cleavage directions, and specific gravity about 2.68–2.72.
Formation & geological history
Forms mainly in mafic igneous rocks such as gabbro, anorthosite, and basalt as magma cools; much material is Precambrian, especially from the Canadian Shield, though age varies by deposit.
Uses & applications
Used for cabochons, beads, carvings, and ornamental stone; attractive specimens commonly have stronger blue, green, or multicolor flashes.
Geological facts
Its iridescence results from light interference in microscopic, compositionally layered feldspar lamellae—not from surface coating.
Field identification & locations
Identify by its relatively soft glassy surface, feldspar cleavage, gray body color, and flash that appears when the stone is rotated under directional light; common sources include Madagascar, Canada, Finland, Norway, and Russia.
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