mineral

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Hardness: 6.0-6.5 on Mohs scale; Color: Dark gray to gray-black base with iridescent flashes of blue, green, and gold; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68 to 2.72.

Hardness: 6
Luster: Vitreous to pearly

Identified March 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of mafic igneous rocks such as basalt, gabbro, and norite. It is a member of the plagioclase feldspar series. Its iridescent effect, known as labradorescence, is caused by internal submicroscopic layering that diffracts light.

Uses & applications

Primarily used in jewelry (cabochons, beads) and as an ornamental stone in interior design (countertops, tiles). It is also highly valued by mineral collectors for its unique optical properties.

Geological facts

Labradorite was first discovered in 1770 on St. Paul Island, Labrador, Canada. An exceptionally colorful variety found in Finland is known as Spectrolite. Legend among the Inuit people says that the Northern Lights (Aurora Borealis) were once trapped within the rocks on the Labrador coast until a warrior struck them with a spear.

Field identification & locations

Identify in the field by tilting the specimen to catch 'schiller' or labradorescence (vivid flashes of color). Commonly found in Canada (Labrador), Madagascar, Finland, and Russia. Collectors should look for 'full flash' specimens with minimal fractures.

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