mineral

Polished labradorite-bearing rock

Labradorite, a calcium-rich plagioclase feldspar; likely mixed with quartz and mafic minerals

AI-generated identification · may be incorrect

Hardness about 6–6.5 Mohs; gray, brown, blue-green, and golden patches with vitreous to pearly luster and visible labradorescent flashes. Plagioclase has triclinic crystals and two good cleavage directions; exact composition is uncertain from the photo.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Labradorite crystallizes in cooling mafic igneous rocks such as basalt, gabbro, and anorthosite, generally during Precambrian to younger intrusive events. The specimen appears tumbled or polished, enhancing its sheen and color play.

Uses & applications

Used as an ornamental stone, countertops, carvings, cabochons, and collectible mineral specimens; it has limited industrial value compared with ordinary feldspar.

Geological facts

Its blue or gold iridescence, called labradorescence, results from light interference in thinly exsolved feldspar layers rather than surface paint. Similar-looking polished stones may be larvikite or mixed feldspar.

Field identification & locations

Look for gray feldspar, prominent cleavage, hardness near 6, and angular blue-green or gold flashes when rotated under light; common sources include Labrador, Canada, Madagascar, Finland, and Norway.