mineral

Polished labradorite cabochon

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

AI-generated identification · may be incorrect

Typically gray to blue-gray with glassy luster and blue-green iridescent labradorescence; Mohs hardness 6–6.5, imperfect cleavage, triclinic crystal structure, and specific gravity about 2.68–2.72. The image appears to show a polished, possibly carved specimen with reflective flash.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as basalt, gabbro, and anorthosite as magma cools; major deposits are Precambrian to younger. Its color play results from light interference in finely intergrown feldspar lamellae.

Uses & applications

Used for cabochons, carvings, beads, ornamental objects, and decorative stone; it is generally a collector gemstone rather than a major construction material.

Geological facts

Labradorescence changes with viewing angle and is strongest when the stone is cut parallel to its internal layering. It is commonly confused with moonstone, but labradorite usually shows saturated blue, green, or gold flashes on a gray base.

Field identification & locations

Identify it by gray body color, strong angular blue-green flash, feldspar cleavage, and hardness near 6; common sources include Labrador, Canada, Madagascar, Finland, Norway, and Russia. Confirm with a gemological test because blue flash can occur in treated or imitation materials.