mineral

Labradorite (likely)

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

Hardness: 6 to 6.5 on the Mohs scale. Color: Dark grey to black base with iridescent blue, green, yellow, or red flashes (labradorescence). Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions. Specific gravity: 2.68 - 2.72.

Hardness: 6 to 6
Luster: Vitreous to pearly

Identified June 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous rocks, particularly mafic rocks like basalt and gabbro. Also found in metamorphic rocks. Usually forms as phenocrysts in these rocks as magma cools.

Uses & applications

Commonly used in jewelry, cabochons, carved ornaments, and lapidary work. Sometimes used as a decorative building stone.

Geological facts

Known for its optical phenomenon called 'labradorescence', caused by light interference within the mineral's layered structure. First discovered in Labrador, Canada.

Field identification & locations

Identify by observing the play of color (labradorescence) against a dark background when turned in the light. Often found as polished slices, cabochons, or tumbled stones. Common locations include Canada, Madagascar, and Finland.