mineral

Labradorite

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

Hardness: 6-6.5; Color: Gray to black with labradorescence (blue, green, gold); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.68-2.72

Hardness: 6-6
Color: Gray to black with labradorescence (blue, green, gold)
Luster: Vitreous to pearly

Identified February 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks like basalt and gabbro through the slow cooling of magma. It is part of the plagioclase feldspar series, with some of the most notable deposits found in Precambrian rock formations.

Uses & applications

Primarily used as a gemstone for jewelry, in lapidary work for ornamental carvings, and occasionally as high-end architectural stone for countertops or cladding.

Geological facts

The unique optical effect is called labradorescence, caused by internal light reflections from sub-microscopic layers of exsolution lamellae. It was first discovered on Paul's Island near Nain, Labrador, Canada, in 1770.

Field identification & locations

Identify by rotating the stone under light to reveal hidden flashes of iridescent color. It is commonly found in Canada (Labrador), Madagascar, Russia, and Finland (where it is known as Spectrolite).