mineral

Labradorite

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

Hardness: 6-6.5 Mohs; Color: Gray-green to dark gray with iridescent play of colors (labradorescence); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.68-2.72.

Hardness: 6-6
Luster: Vitreous to pearly

Identified June 2, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed 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 typically found in Protrozoic-aged anorthosite massifs.

Uses & applications

Primarily used as a gemstone in jewelry, decorative carvings, and occasionally as a facing stone in high-end architecture (countertops and tiles). Also valued by mineral collectors and in metaphysical practices.

Geological facts

The iridescent effect, known as labradorescence, is caused by internal lamellar structures that diffract light. It was first officially discovered on Paul's Island near the town of Nain in Labrador, Canada, in 1770.

Field identification & locations

Identify in the field by rotating the specimen to catch the 'flash' of blue, gold, or green color. Commonly found in Canada (Labrador), Madagascar, Norway, and Finland. Highly translucent pieces with full-spectrum flashes (Spectrolite) are most prized.