mineral

Labradorite

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

AI-generated identification · may be incorrect

Hardness: 6-6.5 Mohs; Color: Gray to black with blue/green/gold iridescence (labradorescence); Luster: Vitreous to pearly; Crystal Structure: Triclinic; Specific Gravity: 2.68-2.72

Hardness: 6-6
Luster: Vitreous to pearly

Identified July 5, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Gray to black with blue/green/gold iridescence (labradorescence); Luster: Vitreous to pearly; Crystal Structure: Triclinic; Specific Gravity: 2.68-2.72

Formation & geological history

An intermediate to calcic member of the plagioclase series; usually forms in mafic igneous rocks such as basalt and gabbro. Notable for forming in anorthosite massifs.

Uses & applications

Used primarily in jewelry as cabochons or beads, ornamental carvings, and high-end architectural stone (countertops/tiles).

Geological facts

The iridescent flash is known as 'labradorescence' and is caused by light reflecting off sub-microscopic exsolution lamellae within the feldspar. It was first discovered in Labrador, Canada in 1770.

Field identification & locations

Identify by its dark gray body color and the characteristic colorful metallic flash when tilted under light. Commonly found in Canada, Madagascar, Finland, and Norway.