mineral

Labradorite

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

Hardness: 6-6.5 on the Mohs scale, Color: Grey-green, dark grey, brown, or colorless with distinctive iridescent flashes of blue, green, gold, and orange (labradorescence), Luster: Vitreous to pearly, Crystal Structure: Triclinic, Cleavage: Perfect in two directions, Specific Gravity: 2.68-2.72.

Hardness: 6-6

Identified August 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms in igneous rocks such as basalt, gabbro, and anorthosite, as well as in metamorphic rocks. It crystallizes from cooling magma and is commonly found in mafic intrusive and extrusive environments.

Uses & applications

Widely used in jewelry (pendants, rings, cabochons), ornamental objects, and as a decorative building stone due to its optical phenomenon.

Geological facts

Labradorite is famous for labradorescence, a unique optical effect caused by phase exsolution lamellae that diffract light. It was first discovered in Labrador, Canada, in 1770.

Field identification & locations

Easily identified by its dark grey base color combined with striking flashes of multicolored iridescence when turned in the light. Major deposits are found in Canada, Madagascar, Finland, Australia, and Russia.