mineral

Labradorite

Labradorite, a plagioclase feldspar in the albite–anorthite solid-solution series, approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Typically gray to dark gray with a glassy luster and blue-gray iridescent flashes (labradorescence), visible on the specimen. Hardness is 6–6.5 Mohs; it has triclinic crystals and two prominent cleavage directions. Specific gravity is about 2.7.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms in cooling magma, commonly in gabbroic and anorthositic igneous rocks. It crystallized during the rock’s formation; the image alone cannot determine its age.

Uses & applications

Polished labradorite is used for cabochons, beads, carvings, and decorative objects; feldspar is also used in ceramics and glass.

Geological facts

Its shifting flashes result from light interference within fine internal layers of feldspar. The optical effect is called labradorescence.

Field identification & locations

Look for gray feldspar with angular cleavage and colored flashes that change as the stone is tilted; common sources include Canada, Madagascar, Finland, and Norway. The photographed piece appears to be a small rough specimen.