mineral

Tumbled labradorite

Labradorite, a calcium-sodium plagioclase feldspar, approximately (Ca,Na)(Al,Si)₄O₈

AI-generated identification · may be incorrect

Gray, polished feldspar with scattered dark inclusions; hardness 6–6.5 Mohs, vitreous luster, triclinic crystals, and two good cleavage directions. Labradorite often shows blue, green, or gold iridescence (“labradorescence”), though none is prominent in this view.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms as plagioclase in cooling igneous rocks, especially gabbro and anorthosite; specimens range from Precambrian to geologically recent. Its internal feldspar layers can produce the characteristic optical shimmer.

Uses & applications

Used for ornamental stone, beads, cabochons, and collector specimens; also occurs as a rock-forming mineral.

Geological facts

Labradorite was named for Labrador, Canada, where it was described in 1770; Madagascar, Finland, and Norway are also notable sources.

Field identification & locations

The rounded shape and polish indicate a tumbled specimen; confirm labradorite by moving it under light to look for flashes of color. Dark patches may be inclusions or surface markings.