mineral

Tumbled labradorite (probable)

Labradorite, a plagioclase feldspar; approximate formula (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Small polished dark gray-green sphere with reflective internal flashes, consistent with labradorite; hardness 6–6.5 Mohs, vitreous luster, triclinic crystal structure, two cleavage directions. The photo alone cannot confirm the mineral; similar feldspars may look alike.

Identified October 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms in cooling, calcium-rich igneous rocks such as gabbro and anorthosite. Labradorite-bearing rocks range from ancient to geologically recent, depending on the deposit.

Uses & applications

Used for beads, cabochons, carvings, and decorative stone; also occurs as a rock-forming mineral in some building stone.

Geological facts

Its characteristic iridescent color play, called labradorescence, comes from light interference in microscopic internal layers.

Field identification & locations

Look for blue, green, or gold flashes that shift with viewing angle, plus feldspar-like cleavage; prominent deposits include Labrador, Canada, Finland, Madagascar, and Norway. A polished sphere is commonly sold as a collectible or jewelry bead.