mineral

Labradorite

Feldspar (variety of Anorthite), (Ca,Na)(Al,Si)4O8

Hardness: 6–6.5 Mohs; Color: Gray, green, or blue with iridescent flashes (labradorescence); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.68–2.72.

Hardness: 6–6
Luster: Vitreous to pearly

Identified March 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of mafic igneous rocks such as basalt and gabbro. It is often found in large anorthosite plutons. Major deposits are found in Canada (Labrador), Madagascar, Finland, and Russia.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons and beads) and as a decorative stone in architecture for countertops, wall tiles, and sculptures.

Geological facts

First discovered in Labrador, Canada, in 1770. It is famous for its optical effect known as labradorescence, caused by internal diffraction of light from sub-microscopic layers of exsolution lamellae.

Field identification & locations

Identify in the field by rotating the specimen to catch the 'schiller' effect or colorful flash against a dark gray base. Commonly found in large plutonic igneous masses. Collectors should look for vibrant, multi-colored flashes (spectrolite is the highest grade).

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