mineral

Labradorite

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

Hardness: 6.0-6.5 Mohs scale; Color: Gray to black with iridescent flashes (labradorescence) of blue, green, yellow, or purple; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.68-2.72.

Hardness: 6
Luster: Vitreous to pearly

Identified June 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro, often occurring as large crystal masses in anorthosite. It forms as magma cools, allowing exsolution lamellae to create its signature optical effects.

Uses & applications

Primarily used as a gemstone in jewelry, for decorative carvings, and in high-end architectural countertops or tiles. It is also a very popular mineral for metaphysical collecting.

Geological facts

The iridescent play of colors is known as 'labradorescence,' which is caused by light reflecting off microscopic layers of different feldspar minerals within the stone. A rare variety from Finland that displays the full color spectrum is called Spectrolite.

Field identification & locations

Identified by turning the specimen in the light to see internal 'flashes' of color; without this light play, it appears as a dull gray stone. Commonly found in Labrador (Canada), Madagascar, Finland, and Russia.