mineral

Labradorite

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

Hardness: 6-6.5 on Mohs scale; Color: Gray to black with labradorescence (flashes of blue, green, yellow, orange); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.

Hardness: 6-6
Luster: Vitreous to pearly

Identified May 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as basalt and gabbro through the slow cooling of magma. It is part of the plagioclase feldspar series and is most famously associated with the Labrador region of Canada.

Uses & applications

Primarily used in jewelry (cabochons and beads) and as a decorative stone in architecture (countertops and tiles); also popular among crystal collectors and for spiritual/metaphysical uses.

Geological facts

Labradorite exhibits a unique optical effect known as labradorescence, which is caused by light diffracting from submicroscopic layers within the stone. In Finland, a high-quality variety is known as Spectrolite.

Field identification & locations

Identify by rotating the stone under a light source to search for iridescent metallic-looking flashes. Commonly found in Canada, Madagascar, Norway, and Finland. Look for the distinct twinning and Schiller effect.