mineral

Iridescent labradorite fragment

Labradorite, plagioclase feldspar: approximately An50–70

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; gray to dark base with strong blue-green iridescent labradorescence, vitreous-to-pearly luster, triclinic crystal structure, and two good cleavage directions. The pictured piece appears broken or roughly polished, with reflective cleavage surfaces.

Identified September 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 through exsolution within plagioclase. Major deposits are Precambrian, especially in Madagascar, Finland, Canada, Norway, and Russia.

Uses & applications

Used as an ornamental stone, cabochons, beads, carvings, and architectural facing stone; gem-quality material is collectible. Common rough fragments have modest value.

Geological facts

Its color flash is caused by light interference from microscopic lamellae inside the feldspar, not by surface paint. Spectral colors change strongly with viewing angle.

Field identification & locations

Identify by rotating it under a point light: genuine labradorescence moves across a gray feldspar body, while hardness and cleavage distinguish it from glass. Look for twinning and cleavage rather than bubble-like inclusions.