mineral

Labradorite

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

Hardness: 6.0-6.5 Mohs scale; Color: Gray to dark gray with blue/green iridescence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect; Specific gravity: 2.68-2.72.

Hardness: 6
Color: Gray to dark gray with blue/green iridescence
Luster: Vitreous to pearly

Identified June 29, 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

Hardness: 6.0-6.5 Mohs scale; Color: Gray to dark gray with blue/green iridescence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect; Specific gravity: 2.68-2.72.

Formation & geological history

Formed in mafic igneous rocks through crystallization of magma. It is a calcium-rich member of the plagioclase feldspar group. Most specimens are from the Proterozoic eon.

Uses & applications

Commonly used in jewelry as cabochons, ornamental carvings, and high-end countertop or architectural facing stones due to its aesthetic appeal.

Geological facts

Exhibits a unique optical effect known as labradorescence, caused by internal light reflections from submicroscopic layers of exsolution lamellae within the stone.

Field identification & locations

Identify in the field by looking for a characteristic blue or gold flash (schiller effect) when tilted under light. Significant deposits are found in Labrador (Canada), Finland, Madagascar, and Russia.