mineral

Tumbled labradorite

Labradorite, plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray-brown body with a vitreous luster and likely blue-green iridescent flashes (labradorescence). It has triclinic crystal structure and two cleavages, obscured here by polishing.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as basalt, gabbro, and anorthosite as magma cools; most specimens are Precambrian to younger. Common sources include Madagascar, Canada, Finland, Norway, and Mexico.

Uses & applications

Used as a decorative gemstone, cabochon, tumbled stone, ornamental tile, and feldspar-bearing aggregate. Quality depends strongly on body color, transparency, and strength of labradorescence.

Geological facts

Its color flash results from light interference within microscopic lamellae produced by exsolution during cooling. Spectral colors change with viewing angle rather than appearing uniformly across the surface.

Field identification & locations

Identify it by gray or smoky body color and directional blue, green, gold, or multicolor flash; a glassy luster and feldspar cleavage support the diagnosis. This image shows a polished/tumbled specimen, so field texture is absent.