mineral

Labradorite

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

Hardness: 6-6.5; Color: Dark grey to blue-green with iridescent labradorescence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees.

Hardness: 6-6
Color: Dark grey to blue-green with iridescent labradorescence
Luster: Vitreous to pearly

Identified July 7, 2026More mineral →

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Physical properties

Hardness: 6-6.5; Color: Dark grey to blue-green with iridescent labradorescence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees.

Formation & geological history

Formed in mafic igneous rocks through the cooling of magma. It is a plagioclase feldspar mineral found in rocks like anorthosite, basalt, and gabbro.

Uses & applications

Predominantly used as a gemstone in jewelry, ornamental carvings, and high-end architectural tiles for countertops or cladding.

Geological facts

Labradorite exhibits a unique optical phenomenon called labradorescence, which is caused by internal light scattering off sub-microscopic layers created during cooling (exsolution lamellae).

Field identification & locations

Identify by rotating under a light source to reveal flashes of peacock blue, gold, or green. Common locations include Canada (Labrador), Madagascar, Finland, and Russia.