mineral

Labradorite

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

Hardness: 6-6.5 on Mohs scale. Color: Gray to smoky black base with labradorescence (blue, green, yellow, orange flashes). Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions.

Hardness: 6-6
Luster: Vitreous to pearly

Identified July 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro. It is an intermediate to calcic member of the plagioclase feldspar series, typically crystallizing at high temperatures within cooling magma bodies.

Uses & applications

Primarily used as a gemstone in jewelry, ornamental carvings, and high-end architectural tiles or countertops. It is also a popular specimen for crystal healing collectors.

Geological facts

Labradorite is famous for its optical effect known as labradorescence, which is caused by light diffraction within internal lamellar structures. Legend says the Northern Lights were once trapped in the rocks along the coast of Labrador until a warrior struck them with a spear.

Field identification & locations

Identified by its unique iridescent play of color when rotated under light. Look for dark, dull-looking gray rocks that suddenly flash bright blue or gold. Large deposits are found in Canada (Labrador), Madagascar, Finland, and Russia.