mineral

Polished labradorite

Labradorite, calcium-sodium feldspar: (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Typically gray, beige, or greenish with black veining and a glassy-to-pearly luster; triclinic feldspar with two good cleavage directions and Mohs hardness 6–6.5. The specimen appears polished and may show subdued labradorescence, though its pattern could also indicate feldspar-rich rock or altered anorthosite.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Labradorite crystallizes in slowly cooled mafic igneous rocks, especially anorthosite and gabbro, during Precambrian geological events. It commonly forms large interlocking feldspar grains rather than distinct crystals.

Uses & applications

Used as a decorative stone, lapidary material, cabochons, beads, and architectural facing stone; attractive flash increases jewelry and collector value.

Geological facts

Its characteristic blue, green, gold, or orange optical flash results from light interference within microscopic feldspar lamellae, called schiller or labradorescence.

Field identification & locations

Identify it by its feldspar cleavage, moderate hardness, gray body color, and rotating iridescent flash; common sources include Labrador, Canada, Madagascar, Finland, Norway, and Russia. A glassy luster and cleavage distinguish it from many jaspers.