mineral

Labradorite

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

Hardness: 6-6.5 Mohs. Color: Dark grey to grey-black with 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 May 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro through the crystallization of magma. It is a member of the plagioclase feldspar series. Most notable deposits are found in Labrador, Canada, and Madagascar.

Uses & applications

Primarily used as a gemstone in jewelry, decorative carvings, and as a popular specimen for crystal collectors. It is also used in countertop manufacturing for high-end interiors.

Geological facts

The iridescent effect known as labradorescence is caused by light reflecting off microscopic layers of exsolution lamellae within the stone. In Inuit folklore, it was believed a warrior struck the stone with a spear to release the Northern Lights (Aurora Borealis) into the sky.

Field identification & locations

Identifiable by its characteristic Schiller effect (labradorescence) when tilted in light. Collectors should look for vibrant color flashes. This specific specimen is a 'tower' or 'obelisk' shape, which is a man-made cut designed to showcase the internal reflections.