mineral

Polished labradorite bead strand

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

AI-generated identification · may be incorrect

Mohs hardness 6–6.5; dark gray to black polished beads with blue-gray flashes (labradorescence), vitreous luster, triclinic crystal structure, and two cleavage directions. Specific gravity is about 2.68–2.72.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Labradorite crystallizes from cooling mafic igneous rocks such as basalt, gabbro, and anorthosite, generally during Precambrian to younger geological events. Its optical flashes result from microscopic feldspar lamellae that reflect light.

Uses & applications

Used for cabochons, beads, carvings, ornamental stone, and metaphysical jewelry; it has little industrial use compared with ordinary feldspar. Typical bead strands sell for about $15–$80, with exceptionally vivid, high-quality material reaching $100–$300.

Geological facts

The blue sheen is called labradorescence, not surface glitter, and changes strongly with viewing angle. Labradorite is a feldspar variety rather than a separate mineral species.

Field identification & locations

Identify it by gray-black body color, polished vitreous surface, and moving blue, green, or gold flashes; rotate the specimen under a focused light. Common sources include Labrador, Canada; Madagascar; Finland; Norway; and Ukraine.