mineral

Labradorite

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

Hardness: 6.0-6.5 (Mohs scale), Color: Dark grey to grey-black with labradorescence (blue, green, gold flashes), Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions, Specific gravity: 2.68-2.72.

Hardness: 6

Identified June 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt, gabbro, and norite through slow cooling of magma. It is a plagioclase feldspar mineral primarily found in high-grade metamorphic and igneous environments.

Uses & applications

Used widely as a gemstone in jewelry (cabochons and beads), in decorative items like countertops or tiles, and as a popular collector's mineral.

Geological facts

Labradorite exhibits a unique optical effect known as 'labradorescence,' which is caused by light diffracting within submicroscopic layers of the mineral. It was first discovered in Labrador, Canada, and according to Inuit legend, the Northern Lights were trapped inside the stones.

Field identification & locations

Identify in the field by looking for 'flashes' of color against a dark, dull grey background when tilted. It is commonly found in Canada, Madagascar, Finland (where a high-quality variety called Spectrolite is found), and Norway.