mineral

Polished labradorite

Labradorite, a calcium–sodium feldspar in the plagioclase series, approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; dark gray to black with blue-green iridescent flashes, vitreous luster, triclinic crystals and two cleavage directions. The image appears to show a polished, rounded piece; identification is tentative from the photo.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms in igneous rocks, especially gabbro and basalt, as magma cools; geological ages vary widely. Labradorite is named for Labrador, Canada, where it was first described.

Uses & applications

Used for cabochons, beads, decorative objects, and architectural facing; quality pieces are valued for vivid iridescence.

Geological facts

Its shifting color effect is called labradorescence and comes from light interference in microscopic internal layers.

Field identification & locations

Look for broad blue, green, or gold flashes that shift as the stone is tilted, along with a dark feldspar body. Notable sources include Canada, Madagascar, Finland, and Norway.