mineral

Labradorite

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

Hardness: 6.0-6.5 on the Mohs scale; Color: Gray to dark gray with internal iridescence (blue, green, gold); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions at nearly 90 degrees; Specific gravity: 2.68-2.72.

Hardness: 6
Luster: Vitreous to pearly

Identified March 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks like basalt, gabbro, and norite, as well as in anorthosite. Geologically associated with Precambrian to early Phanerozoic formations. The Schiller effect or 'labradorescence' is caused by sub-microscopic exsolution lamellae within the feldspar structure.

Uses & applications

Commonly used as a gemstone for jewelry (cabochons, beads), decorative ornamental stone, interior architectural facing, and as a popular 'healing' or metaphysical crystal for collectors.

Geological facts

First discovered in Labrador, Canada, in 1770. Inuit legends claimed the stone contained the northern lights (Aurora Borealis) trapped within the rocks. High-quality specimens with full-spectrum color are often referred to as Spectrolite.

Field identification & locations

Identify in the field by rotating the dark gray stone toward a light source to find a hidden 'flash' of iridescent color. Chiefly found in Canada (Labrador), Madagascar, Finland, and Norway. Important for collectors due to its unique optical properties.

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