mineral

Labradorite/Larvikite

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

Hardness: 6-6.5 on Mohs scale; Color: Dark gray to greenish-gray with blue or green iridiscence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.

Hardness: 6-6
Color: Dark gray to greenish-gray with blue or green iridiscence
Luster: Vitreous to pearly

Identified March 22, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Dark gray to greenish-gray with blue or green iridiscence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.

Formation & geological history

Formed in mafic igneous rocks such as basalt or gabbro through the crystallization of magma. It often features a unique optical effect called 'labradorescence' caused by internal lamellar twinning during cooling.

Uses & applications

Used primarily in jewelry as beads or cabochons, as ornamental stone in interior design (countertops and tiles), and as a collector's gemstone.

Geological facts

First discovered in Labrador, Canada in 1770. It is famous for its 'Schiller effect,' which produces iridescent flashes of color when light hits the stone at certain angles.

Field identification & locations

Identify in the field by its dark gray base color paired with sudden flashes of blue, gold, or green when rotated. Often found in Canada, Norway, Madagascar, and Russia.

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