mineral

Labradorite

Plagioclase Feldspar ((Na,Ca)(Al,Si)4O8)

Hardness of 6 to 6.5 on the Mohs scale, color ranges from dark gray, brown, or black with characteristic iridescent flashes of blue, green, gold, or copper (labradorescence), vitreous to pearly luster, triclinic crystal system, good cleavage in two directions, specific gravity around 2.68-2.72.

Identified July 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms primarily in mafic igneous rocks such as basalt, gabbro, and anorthosite through slow cooling of magma deep within the Earth's crust or in intrusive rock bodies.

Uses & applications

Widely used in ornamental objects, high-end jewelry (cabochons, pendants), and architectural facing stones due to its striking optical phenomenon.

Geological facts

Labradorite is famous for its unique optical effect called labradorescence, which is caused by light interference within microscopic lamellar intergrowths in the mineral structure. It was first discovered in Paul Island near Nain in Labrador, Canada, in 1770.

Field identification & locations

Can be identified in the field by its dark base color and the distinctive iridescent colorful flashes when rotated under a light source. Commonly found in Canada, Madagascar, Finland, Australia, and the USA.

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Limonite / Goethite (Iron Ore Mineral nodule)

FeO(OH)·nH2O / FeO(OH)

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Schist

Metamorphic

Septarian Pebble

Septarian nodule / Concretion

sedimentary

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

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