mineral

Polished Labradorite cabochon

Labradorite, Ca( Na,Ca)(Al,Si)₄O₈; plagioclase feldspar

AI-generated identification · may be incorrect

Gray-green, polished, vitreous-to-waxy luster with internal blue-green iridescence (labradorescence), visible here as subtle sheen. Mohs hardness 6–6.5, triclinic crystal structure, two good cleavage directions, and specific gravity about 2.68–2.72.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

An igneous mineral crystallizing mainly in gabbroic and anorthositic rocks as magma cools; most gem-quality material formed in Precambrian bodies, though exact age depends on locality. The pictured piece is human-shaped and polished as a cabochon.

Uses & applications

Used for ornamental stone, cabochon jewelry, beads, carvings, and mineral collecting; it is not generally used as a major construction stone.

Geological facts

Its color flash results from light interference along closely spaced lamellae caused by exsolution within the feldspar. Strong blue, green, or golden flashes are most prized.

Field identification & locations

Identify by gray body color, broad planar cleavage, moderate hardness, and moving blue-green flash under directional light; common sources include Madagascar, Finland, Canada, Norway, and Russia. Avoid ultrasonic cleaning and harsh impacts because cleavage can cause splitting.