mineral

Tumbled labradorite

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

AI-generated identification · may be incorrect

Typically gray to blue-gray with a glassy to pearly luster and strong blue-green iridescent labradorescence; Mohs hardness 6–6.5, triclinic crystal structure, and two good cleavage directions. The specimen appears polished or naturally smoothed, with visible iridescent patches.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as anorthosite, gabbro, and basalt as magma cools; most deposits are Precambrian, commonly roughly 1–1.5 billion years old. Major sources include Madagascar, Canada, Finland, Norway, and Russia.

Uses & applications

Used as a decorative stone, cabochon gemstone, carvings, polished specimens, and architectural facing stone; its value depends mainly on color intensity, coverage, and polish.

Geological facts

Labradorescence results from light interference within microscopic exsolution layers in the feldspar. Spectacular Finnish material is often marketed as spectrolite.

Field identification & locations

Identify it by gray body color, feldspar cleavage, moderate hardness, and blue/green flash that changes with viewing angle; it is not reliably identified from a photograph alone. Common specimens sell for about $5–$30; attractive polished pieces commonly bring $30–$150.