mineral

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Hardness: 6-6.5 Mohs. Color: Gray-green to dark gray with labradorescence (blue, green, gold shifts). Luster: Vitreous to pearly. Crystal Structure: Triclinic. Cleavage: Perfect in two directions. Specific Gravity: 2.68-2.72.

Hardness: 6-6
Luster: Vitreous to pearly

Identified June 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks through the crystallization of magma. It is a plagioclase feldspar commonly found in anorthosite and basalt. Specimens are often from the Proterozoic Era.

Uses & applications

Primarily used in jewelry as cabochons, decorative carvings, interior design (countertops/tiles), and by collectors for its unique optical properties.

Geological facts

Named after Labrador, Canada, where it was discovered in 1770. The metallic sheen is known as 'labradorescence' and is caused by light diffraction within microscopic layers of the mineral.

Field identification & locations

Identified by tilting the stone to see the 'flash' of iridescent colors over a dark base. Common locations include Canada, Madagascar, Finland, and Russia. Collectors look for full-spectrum flashes.