mineral

Labradorite

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

Hardness: 6.0-6.5 on Mohs scale; Color: typically dark gray to gray-black with iridescent flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72.

Hardness: 6
Color: typically dark gray to gray-black with iridescent flashes
Luster: Vitreous to pearly

Identified March 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous rocks, specifically mafic types like basalt and gabbro, through the cooling of magma. It is a member of the plagioclase feldspar series. Its iridescent play of color (labradorescence) is caused by internal lamellar structures that diffract light.

Uses & applications

Primarily used in jewelry (cabochons and beads) and as an ornamental stone for carvings, countertops, and tiles. It is highly valued in the 'healing crystals' and metaphysical community.

Geological facts

Labradorite was first discovered by Moravian missionaries in 1770 on Paul\'s Island, near Nain, Labrador, Canada. A variety found in Finland with intense spectral color is known as Spectrolite.

Field identification & locations

Identify in the field by looking for 'labradorescence'—a metallic luster that flashes blue, green, or gold when rotated under light. Common locations include Canada (Labrador), Madagascar, Finland, and Norway.

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