Rock Identifier
Labradorite (Labradorite (a calcium-enriched sodic plagioclase feldspar mineral - (Ca, Na)(Al, Si)4O8)) — mineral
mineral

Labradorite

Labradorite (a calcium-enriched sodic plagioclase feldspar mineral - (Ca, Na)(Al, Si)4O8)

Hardness: 6.0 to 6.5 on the Mohs scale; Color: Dark gray to greenish-gray with internal labradorescence (shiller) flashes of blue, green, and gold; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions.

Hardness
6
Luster
Vitreous to pearly
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Physical properties

Hardness: 6.0 to 6.5 on the Mohs scale; Color: Dark gray to greenish-gray with internal labradorescence (shiller) flashes of blue, green, and gold; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions.

Formation & geological history

Formed through the crystallization of mafic igneous rocks such as basalt and gabbro, often found in anorthosite complexes. It occurs in large, plutonic igneous masses that cooled slowly, allowing for the internal exsolution lamellae that cause its signature optical effect.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads) and as an ornamental stone for carvings and interior decor like countertops or tiles. It is also highly popular among mineral collectors and the metaphysical community.

Geological facts

First discovered in Labrador, Canada, in 1770. The spectacular play of light is called labradorescence, which is caused by light reflecting off microscopically thin layers of different feldspar minerals within the stone.

Field identification & locations

Identify in the field by looking for a dull gray, glassy stone that exhibits a sudden flash of electric blue or green when tilted under light. Common locations include Canada (Labrador), Madagascar, Finland (where it is called Spectrolite), and Russia.

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