mineral

Labradorite

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

Hardness: 6.0-6.5 on Mohs scale; Color: Dark grey to black with iridescent flashes of blue, green, and gold; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68-2.72

Hardness: 6
Luster: Vitreous to pearly

Identified March 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 through the cooling of magma. It is a member of the plagioclase feldspar series. Its unique play of colors (labradorescence) is caused by internal lamellar twinning which occurs as the mineral cools.

Uses & applications

Commonly used in jewelry (cabochons and beads), decorative ornaments like the pictured sphere, and architectural tiles or countertop slabs in high-end construction.

Geological facts

First discovered in Labrador, Canada, in 1770. According to Inuit legend, the Northern Lights (Aurora Borealis) were trapped inside rocks along the coast of Labrador until a warrior struck them with a spear, releasing the lights into the sky.

Field identification & locations

Identify in the field by rotating the stone until an iridescent flash of color appears from within the dark surface. Significant deposits are found in Canada, Madagascar, Finland, and Norway. Collectors should look for 'spectrolite' (a high-grade variety from Finland) for the best color range.