mineral

Polished labradorite cabochon

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

AI-generated identification · may be incorrect

Mohs hardness 6–6.5; dark gray to black body with blue-green iridescent labradorescence, vitreous luster, triclinic crystal structure, and two cleavages near 90°. The rounded, glossy shape indicates a polished cabochon.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as gabbro, anorthosite, and basalt from slow-cooling magma; major deposits are Precambrian, though labradorite forms across a broad geological range.

Uses & applications

Used for cabochon jewelry, carvings, ornamental objects, and mineral collecting. It is not generally used as a major construction stone in this polished form.

Geological facts

Its shifting blue flash results from light interference within microscopic lamellae caused by exsolution between plagioclase compositions.

Field identification & locations

Identify by the dark feldspar body and directional blue flash that changes with viewing angle; notable sources include Labrador, Canada, Madagascar, Finland, Norway, and Russia.