mineral

Polished labradorite cabochon

Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Typically Mohs 6–6.5, with a vitreous luster and triclinic crystal structure; this polished, dark gray-green piece shows a reflective blue-green flash (labradorescence).

Identified September 26, 2026More mineral →

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Physical properties

Typically Mohs 6–6.5, with a vitreous luster and triclinic crystal structure; this polished, dark gray-green piece shows a reflective blue-green flash (labradorescence).

Formation & geological history

Forms as calcium-rich plagioclase in cooling igneous rocks, especially gabbro and anorthosite. Its age depends on its deposit; labradorite-bearing rocks range from ancient Precambrian to younger formations.

Uses & applications

Used for cabochons, beads, ornamental objects, and decorative stone; it is not generally used as a major construction material.

Geological facts

Labradorescence comes from light interference within fine, layered mineral structures inside the feldspar.

Field identification & locations

Common sources include Labrador, Canada, Madagascar, Finland, and Norway. Look for a gray feldspar base with angle-dependent flashes; the photo alone cannot confirm the exact mineral.