mineral

Labradorite

Labradorite, a plagioclase feldspar in the labradorite–bytownite series; approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray to dark gray with blue-green iridescent flashes (labradorescence), a vitreous to pearly luster, triclinic crystal structure, and two good cleavage directions near 90°. The specimen appears cut and polished, though its exact identity cannot be confirmed from the image alone.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms as plagioclase in cooling mafic igneous rocks, commonly gabbro and basalt; its age depends on the host rock and cannot be determined visually. The color flash results from light interference in fine internal layers.

Uses & applications

Used for cabochons, beads, decorative objects, and architectural facing stone; attractive flash increases its jewelry and collector appeal.

Geological facts

Labradorescence is a directional optical effect, so the blue-green flash changes as the stone is tilted.

Field identification & locations

Look for a gray feldspar base with broad, shifting blue, green, or gold flashes; common sources include Canada’s Labrador region, Madagascar, Finland, and Russia. Rotate it under light to reveal the flash.