mineral

Polished labradorite (likely)

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

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray-green to brown body color with possible subdued blue-green labradorescence, vitreous to pearly luster, triclinic crystal structure, and good cleavage. The rounded shape indicates tumbling or polishing.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in slowly cooled mafic igneous rocks such as gabbro, anorthosite, and basaltic intrusions, commonly during Precambrian to younger magmatic events. Labradorite is especially abundant in Madagascar, Finland, Canada, Norway, and the United States.

Uses & applications

Used as a decorative stone, cabochon gemstone, carvings, countertops, and feldspar-bearing aggregate. Strong optical flash increases jewelry and collector appeal.

Geological facts

Its characteristic iridescence results from light interference within microscopic exsolution layers in the feldspar. The pictured specimen’s muted appearance may reflect orientation, lighting, or relatively low-grade labradorescence.

Field identification & locations

Identify by gray feldspar body color, polished flash when tilted under a point light, hardness near steel, and two cleavage directions; it should not fizz in dilute acid. Confirmatory identification may require microscopy or refractive-index testing.