Labradorite (Dark or Black variety)

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.

Identified on: 4/28/2026

Mode: Standard