mineral

Labradorite

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

Hardness: 6-6.5 Mohs; Color: Grey to black with labradorescence (blue, green, gold flashes); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at 86 degrees; Specific gravity: 2.68-2.72

Hardness: 6-6
Luster: Vitreous to pearly

Identified June 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks like basalt and gabbro, and sometimes in metamorphic rocks. Notable deposits are found in Anorthosite complexes.

Uses & applications

Used primarily in jewelry as gemstones (cabochons), interior decoration (countertops, tiles), and for metaphysical collecting.

Geological facts

Named after the Labrador region in Canada where it was first discovered in 1770. The iridescent effect, called labradorescence, is caused by internal light scattering from submicroscopic exsolution lamellae.

Field identification & locations

Identify by rotating the stone under light to see iridescent flashes. Commonly found in Canada (Labrador), Madagascar, Norway, and Finland (Spectrolite variant).