mineral

Polished labradorite

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

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray-green to blue-gray body with muted blue-green iridescence, vitreous luster, and two cleavages near 90°. It has a triclinic crystal structure and specific gravity around 2.68–2.72.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Forms in slowly cooled mafic igneous rocks such as gabbro, anorthosite, and basaltic intrusions. Most gem-quality material is associated with Precambrian to Paleozoic anorthosite complexes.

Uses & applications

Cut and polished for cabochons, beads, carvings, and ornamental objects; also used as a decorative stone and feldspar resource. This specimen’s value is mainly collectible or lapidary.

Geological facts

Its characteristic labradorescence results from light interference in microscopic exsolution layers within the feldspar. The blue flash is strongest when the stone is viewed from the correct angle.

Field identification & locations

Identify by gray body color, angular feldspar cleavage, hardness, and directional blue or green flash; it should not be confused with similarly colored aventurine or dyed stones. Common sources include Labrador, Canada; Finland; Madagascar; Norway; and Russia.