mineral

Labradorite

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

Hardness: 6-6.5 (Mohs scale), Color: Dark grey to grey-black with labradorescence (blue, green, gold flashes), Luster: Vitreous to pearly, Crystal structure: Triclinic, Specific Gravity: 2.68-2.72.

Hardness: 6-6

Identified June 3, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs scale), Color: Dark grey to grey-black with labradorescence (blue, green, gold flashes), Luster: Vitreous to pearly, Crystal structure: Triclinic, Specific Gravity: 2.68-2.72.

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro, and also in some metamorphic rocks. It crystallizes from cooling magma in deep crustal environments.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons, beads) and as a decorative stone in architecture (countertops, tiles). It is also highly valued by mineral collectors for its optical effects.

Geological facts

Exhibits a unique optical effect known as labradorescence, caused by internal lamellar twinning which diffracts light. Legend says the Inuit people once believed the Northern Lights were trapped within the rocks on the Labrador coast.

Field identification & locations

Identify in the field by looking for a play of metallic colors (schiller effect) when the stone is tilted. Heavily found in Labrador (Canada), Finland, Madagascar, and Norway.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

metamorphic