mineral

Labradorite

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

Hardness: 6-6.5; Color: Grey-green to black with iridescent flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72

Hardness: 6-6
Color: Grey-green to black with iridescent flashes
Luster: Vitreous to pearly

Identified June 27, 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: 6-6.5; Color: Grey-green to black with iridescent flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72

Formation & geological history

Formed in igneous or metamorphic rocks through the crystallization of magma or via metamorphism of mafic rocks. It is part of the plagioclase feldspar series.

Uses & applications

Predominantly used as a gemstone for jewelry, in cabochons, and as an ornamental stone in architecture and interior design (countertops).

Geological facts

Famous for its 'labradorescence,' a schiller effect caused by light reflecting off microscopic lamellae of alternating composition within the stone. It was first discovered in Labrador, Canada.