mineral

Polished labradorite egg

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

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; dark gray-blue to green body with blue-green iridescent labradorescence, vitreous luster, triclinic crystals, and two good cleavage directions. This is a polished, shaped specimen, so natural cleavage and crystal faces are mostly absent.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Labradorite crystallizes in slowly cooled mafic igneous rocks such as anorthosite, gabbro, and basalt, mainly during Precambrian to younger geological episodes. Its optical flashes result from microscopic exsolution layers within the feldspar.

Uses & applications

Used as an ornamental stone, polished sphere or egg, carvings, countertops, and cabochon jewelry. Strongly iridescent pieces are desirable for collectors and interior décor.

Geological facts

Labradorescence is an interference effect caused by light scattering between alternating feldspar lamellae. The most famous commercial material comes from Labrador, Canada, with important deposits also in Madagascar, Finland, and Norway.

Field identification & locations

Identify it by its dark feldspar body, glassy polish, and blue or multicolor flashes that change with viewing angle; it is softer and less uniformly colored than glass. Examine under directional light and rotate the piece to reveal the flash.