mineral

Labradorite

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

Hardness: 6.0-6.5 Mohs scale; Color: Gray to black with labradorescence (flashes of blue, green, gold); Luster: Vitreous to pearly; Crystal structure: Triclinic; Specific Gravity: 2.68-2.72.

Hardness: 6
Luster: Vitreous to pearly

Identified June 3, 2026More mineral →

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Physical properties

Hardness: 6.0-6.5 Mohs scale; Color: Gray to black with labradorescence (flashes of blue, green, gold); Luster: Vitreous to pearly; Crystal structure: Triclinic; Specific Gravity: 2.68-2.72.

Formation & geological history

Forms in mafic igneous rocks such as basalt and gabbro, and in anorthosites. It is part of the plagioclase feldspar series and crystallizes from cooling magma.

Uses & applications

Primarily used in jewelry as gemstones (cabochons), oratory ornamental objects, and as a decorative stone in high-end countertops or architecture.

Geological facts

Labradorite is famous for the optical phenomenon known as labradorescence, which is caused by light reflecting off sub-microscopic layers of exsolution lamellae within the stone. In Inuit lore, it is believed to contain the Northern Lights.

Field identification & locations

Identify by finding iridescent flashes of color when tilted under light. Commonly found in Canada (Labrador), Madagascar, Finland, and Russia. Collectors value specimens with strong, multi-color fire.