Labradorite

Physical Properties

Hardness: 6-6.5 (Mohs scale), Color: Dark gray to gray-green with iridescent 'labradorescence' (blue, green, gold), Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions.

Formation & Geological History

Formed in mafic igneous rocks such as basalt or gabbro through crystallization from cooling magma. Labradorescence is caused by internal lamellar structures that reflect light in a phenomenon called the Schiller effect.

Uses & Applications

Primarily used as a gemstone in jewelry (pendants, rings, earrings), ornamental carvings, and occasionally in high-end architectural tiles or countertops.

Geological Facts

First discovered in 1770 on the Paul's Island in Labrador, Canada. It is famous for its optical effect, which some Inuit legends claim is the Northern Lights trapped inside the stones.

Field Identification & Locations

Identify in the field by rotating the stone under light to reveal hidden metallic flashes of color. It is commonly found in Canada (Labrador), Madagascar, Norway, and Finland (Spectrolite variety).

Identified on: 4/15/2026

Mode: Standard