mineral

Labradorite

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

AI-generated identification · may be incorrect

Mohs hardness of 6 to 6.5; displays gray-to-dark body color with iridescent flashes of blue, green, and gold known as labradorescence; triclinic crystal system with vitreous to pearly luster.

Identified October 17, 2026More mineral →

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Physical properties

Mohs hardness of 6 to 6.5; displays gray-to-dark body color with iridescent flashes of blue, green, and gold known as labradorescence; triclinic crystal system with vitreous to pearly luster.

Formation & geological history

Forms primarily in mafic igneous rocks such as basalt and gabbro, as well as anorthosite, through slow cooling of magma deep within the Earth's crust.

Uses & applications

Widely used in ornamental jewelry, decorative countertops, carvings, and highly prized by mineral collectors for its optical effects.

Geological facts

First discovered in Labrador, Canada, in 1770, labradorite's unique play of colors is caused by microscopic lamellar intergrowths that refract light.

Field identification & locations

Easily identified by its characteristic metallic iridescence when rotated in the light. Major deposits are found in Canada, Madagascar, Finland, and Australia.