mineral

Labradorite (Dark or Black variety)

Labradorite (member of Plagioclase Feldspar group), (Na,Ca)(Si,Al)4O8

Hardness: 6-6.5 on Mohs scale; Color: Dark grey to black with labradorescence (blue/green/gold flashes); Luster: Vitreous to pearly; Crystal Structure: Triclinic; Specific Gravity: 2.68-2.72.

Hardness: 6-6
Luster: Vitreous to pearly

Identified April 28, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Dark grey to black with labradorescence (blue/green/gold flashes); Luster: Vitreous to pearly; Crystal Structure: Triclinic; Specific Gravity: 2.68-2.72.

Formation & geological history

Formed through the crystallization of mafic igneous rocks such as basalt or gabbro; it can also be found in certain metamorphic rocks. Known for being anorthosite-associated.

Uses & applications

Primarily used as a gemstone in jewelry, decorative carvings, interior design (countertops), and as a popular metaphysical or collector's specimen.

Geological facts

The shimmering iridescent effect is called labradorescence, caused by internal lamellar twinning which sub-microscopically scatters light.

Field identification & locations

Identify in the field by looking for the distinct 'schiller' effect when rotated under light. Major locations include Labrador (Canada), Madagascar, Finland, and Norway.

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