mineral

Polished labradorite cabochon

Labradorite, CaNaAl₃Si₃O₈ (plagioclase feldspar)

AI-generated identification · may be incorrect

Typically gray to dark gray with a polished vitreous-to-pearly luster and blue iridescent labradorescence; hardness 6–6.5 Mohs, triclinic crystal structure, and two cleavages. The oval form is a human-shaped cabochon.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as gabbro, anorthosite, and basalt as feldspar crystallizes from magma; most deposits are Precambrian to younger. The specimen’s blue flash comes from light interference within fine feldspar lamellae.

Uses & applications

Used for cabochon jewelry, ornamental objects, and mineral collecting; it is not generally used as a major construction aggregate in gem-quality form.

Geological facts

Labradorescence changes with viewing angle and is strongest when the stone is oriented correctly. Blue, green, gold, and multicolor flashes are common varieties.

Field identification & locations

Identify by gray body color, bright directional color flash, feldspar cleavage, and moderate hardness; notable sources include Labrador, Canada, Madagascar, Finland, Norway, and Russia. Avoid ultrasonic cleaning and hard impacts because cleavage can cause splitting.