gemstone

Polished labradorite cabochon

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

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray to transparent with blue iridescent flash, vitreous luster, triclinic crystal structure, and two good cleavage directions. The rounded, glossy form is a polished cabochon.

Identified August 26, 2026More gemstone →

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Physical properties

Hardness 6–6.5 Mohs; gray to transparent with blue iridescent flash, vitreous luster, triclinic crystal structure, and two good cleavage directions. The rounded, glossy form is a polished cabochon.

Formation & geological history

Forms in slowly cooled mafic igneous rocks such as anorthosite, gabbro, and basalt, commonly during Precambrian to younger intrusive events. Its blue sheen results from light interference in microscopic feldspar lamellae.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; valued in jewelry for strong blue, green, or gold labradorescence.

Geological facts

Its color play is called labradorescence, not true body color. The strongest material is often marketed from Madagascar, Finland, Canada, and Norway.

Field identification & locations

Identify by gray translucent body, prominent blue flash when tilted, feldspar cleavage, and moderate hardness; it can scratch glass but is softer than quartz. Common sources include Labrador, Canada, Madagascar, Finland, and Norway.