mineral

Labradorite

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

Hardness: 6.0-6.5 on Mohs scale; Color: Gray to green with blue, green, and gold labradorescence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific Gravity: 2.68 to 2.72

Hardness: 6
Color: Gray to green with blue, green, and gold labradorescence
Luster: Vitreous to pearly

Identified July 6, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro, and also in some metamorphic rocks and anorthosites. It crystallizes from magma and develops its unique flash (labradorescence) due to lamellar twinning or exsolution during cooling.

Uses & applications

Primarily used as a gemstone in jewelry, decorative carvings, and as a polished specimen for collectors. In higher quantities, it is sometimes used as a building material for countertops and tiles.

Geological facts

The unique play of color is called labradorescence, which is caused by light diffracting from sub-microscopic layers of exsolution lamellae within the stone. It was first officially discovered in Labrador, Canada, in 1770.

Field identification & locations

Identify in the field by its dark gray appearance and the sudden flash of iridescent colors when rotated under light. Common locations include Canada (Labrador), Madagascar, Norway, and Finland (where a high-quality variety called Spectrolite is found).

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Mineral

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Mineral/Rock

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