mineral

Polished labradorite cabochon

Labradorite, plagioclase feldspar; approximately NaAlSi₃O₈–CaAl₂Si₂O₈

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; typically gray to dark gray with blue-green iridescent labradorescence, vitreous to pearly luster, triclinic crystal structure, and two cleavages. The polished dome and blue-green flash are characteristic of a cabochon.

Identified September 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as gabbro, anorthosite, and basalt through slow cooling and crystallization; commonly Precambrian to younger. The optical flash results from light interference within exsolution lamellae in the feldspar.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; rarely used as aggregate or decorative stone. Jewelry value depends strongly on flash color, coverage, and polish.

Geological facts

Labradorescence is strongest when the stone is viewed from particular angles and may appear blue, green, gold, or multicolored. This specimen appears polished and may have a dark backing or edge treatment to enhance the color.

Field identification & locations

Identify by its gray body, feldspar-like cleavage, hardness near quartz, and directional blue-green flash; common sources include Labrador, Canada, Madagascar, Finland, Norway, and Russia. It is not reliably identified by color alone because similar treated feldspar and glass exist.