mineral

Polished labradorite cabochon

Labradorite, a calcium-sodium feldspar: (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Typically gray to dark gray with a vitreous-to-pearly luster and blue-green iridescent flashes (labradorescence); Mohs hardness 6–6.5, triclinic crystal structure, two good cleavage directions, and specific gravity about 2.68–2.72.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms in slowly cooled mafic igneous rocks such as anorthosite, gabbro, and basaltic intrusions, generally during Precambrian to younger geological events. The pictured specimen is polished and shaped as a cabochon.

Uses & applications

Used for cabochon jewelry, ornamental carvings, counters, and decorative stone; strong-quality blue or multicolor material is valued by collectors.

Geological facts

Its optical color play results from light interference in microscopic exsolution layers within the feldspar, not from surface pigment.

Field identification & locations

Identify it by gray body color, feldspar cleavage, and moving blue-green flashes under directional light; notable sources include Madagascar, Finland, Canada, Norway, and Russia. A common polished cabochon is worth about $5–$30 USD; vivid, large, well-centered specimens may reach $50–$200+.