mineral

Labradorite-bearing feldspathic rock

Labradorite, a calcium-rich plagioclase feldspar; likely in a mafic host rock

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray to blue-gray, with blue-gold iridescent labradorescence and vitreous to pearly luster. Triclinic feldspar crystals show two cleavages near 90°; specific gravity about 2.68–2.72.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Labradorite crystallizes from cooling basaltic to gabbroic magma, commonly in Precambrian anorthosite and related rocks. The specimen appears naturally rough and weathered, though its exact geological age cannot be determined visually.

Uses & applications

Used as a decorative stone, lapidary material, countertops, carvings, and cabochons; attractive pieces are popular in jewelry and mineral collections.

Geological facts

Its blue, green, gold, or multicolor flash results from light interference between microscopic feldspar lamellae produced during exsolution.

Field identification & locations

Identify it by gray body color, excellent cleavage, and directional blue-gold flash when tilted under a light. Common sources include Labrador and Newfoundland, Canada; Madagascar; Finland; Norway; and Russia.