mineral

Polished labradorite sphere

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

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray to greenish-gray body color, vitreous luster, and commonly iridescent blue, green, or gold flashes (labradorescence). It has triclinic crystal structure and two good cleavage directions; the image shows a polished, rounded specimen with visible internal fractures and feldspar zones.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Labradorite crystallizes in mafic igneous rocks such as gabbro, basalt, and anorthosite as magma cools. Deposits are Precambrian to younger, with major gem-quality material from Madagascar, Finland, Canada, and Norway.

Uses & applications

Used for decorative spheres, cabochons, beads, carvings, and collectors’ specimens; large slabs are also used as ornamental stone. It is generally unsuitable for heavily trafficked construction surfaces because cleavage can promote chipping.

Geological facts

Its characteristic color play results from microscopic lamellar intergrowths that diffract light, not from surface pigment. Strong flashes are best seen by rotating the stone under directional light.

Field identification & locations

Identify it by gray feldspar appearance, cleavage, moderate hardness, and blue-green flash that changes with viewing angle; do not confuse it with moonstone or slag glass. Common localities include Madagascar, Labrador, Finland, Norway, and Ukraine.