mineral

Polished blue labradorite

Labradorite, calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

AI-generated identification · may be incorrect

Typically gray to brown with blue iridescent flashes (labradorescence), vitreous to pearly luster, Mohs hardness 6–6.5, triclinic crystal structure, and two good cleavage directions. The pictured piece appears tumbled or polished.

Identified August 9, 2026More mineral →

Explore Polished blue 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 gabbro, anorthosite, and basaltic bodies as magma cools; most deposits are Precambrian to younger. Labradorite is especially associated with Madagascar, Finland, Canada, Norway, and Russia.

Uses & applications

Used for cabochons, beads, carvings, decorative objects, and collector specimens; commercial value depends strongly on flash color, coverage, and polish.

Geological facts

Its blue sheen is caused by light interference from microscopic lamellae produced during feldspar exsolution. Strong blue or multicolor labradorescence is the most desirable feature.

Field identification & locations

Identify it by gray-brown body color, sharp blue flashes that change with viewing angle, feldspar cleavage, and hardness below quartz. Avoid confusing it with blue glass or dyed chalcedony.