mineral

Labradorite cabochon

Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Typically gray, blue-green, or brown with iridescent blue-gold labradorescence; Mohs hardness 6–6.5, vitreous-to-pearly luster, triclinic crystals, and two good cleavage directions. The pictured stone is a polished oval cabochon in a metal setting.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in mafic igneous rocks such as anorthosite, gabbro, and basalt as magma cools; much of gem-quality material formed in Precambrian crust, though deposits vary in age. Common sources include Madagascar, Finland, Canada, Norway, and Russia.

Uses & applications

Used for cabochon jewelry, ornamental objects, and mineral collections; highly colorful material is valued for its optical flash.

Geological facts

Its blue, gold, and green sheen results from light interference between microscopic lamellae produced by feldspar exsolution. Strong flash is usually visible only from particular viewing angles.

Field identification & locations

Identify by gray body color, prominent directional blue-gold flash, feldspar-like cleavage, and hardness below quartz; distinguish from synthetic glass by natural internal layers and uneven flash. Avoid ultrasonic cleaning and harsh impacts.