mineral

Tumbled labradorite

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

AI-generated identification · may be incorrect

Typically gray-green to brown with blue, green, or gold iridescent labradorescence; vitreous to pearly luster, Mohs hardness 6–6.5, monoclinic crystal structure, and two good cleavage directions. The specimen appears polished/tumbled and shows feldspar-like cleavage and reflective patches.

Identified August 8, 2026More mineral →

Explore Tumbled labradorite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms in mafic igneous rocks such as basalt, gabbro, and anorthosite as magma cools; major deposits are Precambrian, especially in Labrador, Canada, and Madagascar. Geological ages commonly range from hundreds of millions to over a billion years.

Uses & applications

Used as a decorative stone, cabochon, beads, carvings, and metaphysical material; rarely used industrially because attractive specimens are more valuable as gemstones.

Geological facts

Its color flashes result from light interference within microscopic exsolution layers of feldspar, not surface pigment. Strong labradorescence changes with viewing angle and distinguishes it from ordinary gray feldspar.

Field identification & locations

Look for a relatively soft gray-green feldspar with angular cleavage and blue-green flashes when tilted under a directional light; it should not fizz in dilute acid. Common sources include Canada, Madagascar, Finland, Russia, and Norway.