mineral

Tumbled labradorite

Labradorite, calcic plagioclase feldspar (approximately An50–70; (Ca,Na)(Al,Si)₄O₈)

AI-generated identification · may be incorrect

Gray to brown, polished, with blue-green iridescent labradorescence; vitreous luster and poorly visible cleavage. Mohs hardness 6–6.5, triclinic crystal structure, specific gravity about 2.68–2.72.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms in slowly cooled mafic igneous rocks such as anorthosite, gabbro, and basalt through feldspar crystallization; specimens are generally Precambrian to younger. The flash results from light interference in microscopic exsolution layers within the feldspar.

Uses & applications

Used as a decorative stone, cabochons, beads, carvings, and polished collectibles; architectural labradorite is used occasionally for countertops and facing stone.

Geological facts

Its blue flash is strongest when the stone is viewed at the correct angle and under directional light. The specimen appears tumbled and polished rather than naturally weathered.

Field identification & locations

Identify by gray body color, moderate hardness, feldspar cleavage, and directional blue or multicolor flash; common sources include Madagascar, Finland, Canada, Norway, and Russia.