mineral

Polished labradorite

Labradorite, calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray-green to smoky body color, vitreous luster, triclinic crystals, and two cleavage directions. The blue, green, and gold flashes are labradorescence caused by light interference in microscopic feldspar lamellae.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as anorthosite, gabbro, and basaltic intrusions as molten rock cools; many gem-quality deposits are Precambrian. The pictured piece is shaped and polished.

Uses & applications

Used for cabochons, beads, carvings, ornamental stone, countertops, and mineral collecting. Strong, colorful labradorescence increases jewelry and collector appeal.

Geological facts

Labradorite is a variety of plagioclase feldspar, not a separate crystal system. Its optical flash changes dramatically with viewing angle and surface orientation.

Field identification & locations

Identify it by its dark gray body, feldspar cleavage, moderate hardness, and vivid angle-dependent flashes; common sources include Labrador, Canada, Madagascar, Finland, Norway, and Russia. It is softer than quartz, so avoid scratching and harsh abrasives.