mineral

Labradorite

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

Hardness: 6-6.5 on Mohs scale; Color: Gray-green to dark gray with iridescent flashes of blue, violet, gold; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68-2.72.

Hardness: 6-6
Luster: Vitreous to pearly

Identified June 25, 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, as well as in anorthosites. It often forms during the slow cooling of magma, allowing for the exsolution lamellae that cause its signature labradorescence.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons, beads), decorative carvings, and occasionally as high-end architectural stone for countertops or tiles.

Geological facts

The unique play of color is called 'labradorescence,' caused by internal light reflections from twin lamellae. Legend says the Inuit believed the Northern Lights were trapped inside these stones until a warrior struck them with a spear.

Field identification & locations

Identify in the field by its dark gray base color and the 'flash' of spectral colors when tilted. Commonly found in Labrador (Canada), Madagascar, Finland, and Russia. Collectors should look for 'Spectrolite' for the highest quality color range.