mineral

Labradorite

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

AI-generated identification · may be incorrect

Mohs hardness: 6-6.5; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Notable for labradorescence (iridescent play of colors).

Hardness: 6-6
Color: Gray-green to dark gray
Luster: Vitreous to pearly

Identified July 16, 2026More mineral →

Explore Labradorite in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Mohs hardness: 6-6.5; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Notable for labradorescence (iridescent play of colors).

Formation & geological history

Plagioclase feldspar that forms in mafic igneous rocks like basalt and norite, as well as in anorthosites. It results from the crystallization of magma.

Uses & applications

Frequently used as a gemstone in necklaces and rings, for ornamental carvings, and high-end architectural countertops.

Geological facts

The iridescent effect known as labradorescence is caused by light reflecting off sub-microscopic layers of exsolution lamellae within the crystal.

Field identification & locations

Identify in the field by rotating the specimen in light to see the blue, gold, or green flashes. It is commonly found in Canada (Labrador), Madagascar, and Finland.