mineral

Labradorite

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

Hardness of 6 to 6.5 on the Mohs scale, grayish-green to dark gray body color with characteristic iridescent optical phenomenon called labradorescence (flashes of blue, green, gold, and copper), vitreous to pearly luster, triclinic crystal system, perfect cleavage in two directions.

Identified August 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms primarily in mafic igneous rocks such as basalt, gabbro, and anorthosite, as well as in some metamorphic and syenitic rocks through slow cooling of magma deep within the Earth's crust.

Uses & applications

Widely used as a gemstone in rings, pendants, and other jewelry due to its captivating optical play of colors, as well as being a popular ornamental and decorative stone.

Geological facts

Labradorite was first discovered in Paul Island near Illuak, Labrador, in Canada in 1770, which is where its name originates. Inuit legends claim that the Northern Lights were trapped inside the rocks along the coast of Labrador until a brave warrior freed most of them with a spear strike.

Field identification & locations

Readily identified by its dark, unassuming appearance from certain angles that abruptly transforms into vibrant, metallic flashes of rainbow colors when turned in the light. Major sources include Canada, Madagascar, Finland, Australia, and Russia.