mineral

Polished labradorite cabochon

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

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; dark gray to blue-gray with blue-green iridescent labradorescence, vitreous luster, triclinic crystal structure, and two good cleavage directions. The oval, domed 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 basalt, gabbro, and anorthosite as magma cools; major deposits are Precambrian, especially Madagascar, Finland, Canada, and Norway. The specimen is human-cut and polished.

Uses & applications

Used for cabochon jewelry, carvings, ornamental objects, and mineral collections. Commercial value is driven chiefly by the strength, color, and coverage of its flash.

Geological facts

Its blue sheen is caused by interference and diffraction from fine lamellar intergrowths within the feldspar. Strong blue or multicolor flash is considered especially desirable.

Field identification & locations

Identify it by its dark body, feldspar-like cleavage, moderate hardness, and changing blue flash when tilted under directional light; avoid confusing it with glossy obsidian or coated glass.