mineral

Labradorite

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

Hardness: 6-6.5 on Mohs scale. Color: Gray to black baseline with iridescent flashes of blue, green, and gold (labradorescence). 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, gabbro, and norite through the slow cooling of magma. It belongs to the plagioclase feldspar series. It was first discovered in Labrador, Canada, and occurs in rocks of various geological ages from the Proterozoic to the Cenozoic.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons, beads) and as an ornamental stone for carvings, countertops, and artistic pieces due to its unique optical properties.

Geological facts

The optical effect known as labradorescence is caused by internal fractures or 'lamellae' that reflect light back and forth, creating interference. In Finland, a high-quality variety is known as Spectrolite.

Field identification & locations

Identify by rotating the stone under a light source to reveal vivid iridescent flashes. It is commonly found in Canada, Madagascar, Finland, and Norway. Collectors look for high 'flash' coverage and depth of color.