mineral

Polished gray-green stone, possibly labradorite

Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Smooth, rounded, polished pebble with a gray-green body; hardness about 6–6.5 Mohs, vitreous to pearly luster, triclinic crystals, and two cleavages. The image does not show the colorful iridescence often used to confirm labradorite, so identification is tentative.

Identified September 26, 2026More mineral →

Explore Polished gray-green stone, possibly 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

Labradorite crystallizes in slowly cooling, silica-poor igneous rocks such as gabbro and anorthosite; it formed over geological time in intrusive or metamorphic settings.

Uses & applications

Commonly cut and polished for beads, cabochons, ornaments, and collectible specimens; feldspar also has industrial uses in glass and ceramics.

Geological facts

Its characteristic flashes of blue, green, or gold are called labradorescence and arise from light interference within microscopic feldspar layers.

Field identification & locations

Check for colored flashes by tilting under a bright light and confirm hardness or cleavage; labradorite occurs in Labrador, Canada, Madagascar, Finland, and other regions. The pebble’s exact identity cannot be established from the photo alone.