mineral

Labradorite

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

Hardness: 6-6.5 Mohs scale; Color: Dark gray to gray-black base with labradorescence (vibrant blue, green, or gold flashes); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68 to 2.72.

Hardness: 6-6
Luster: Vitreous to pearly

Identified March 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of mafic igneous rocks such as basalt or gabbro, or in metamorphic rocks. Most notable deposits date back to the Proterozoic eon. Significant deposits are found in anorthosite complexes.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons, beads), decorative carvings, and as a high-end architectural facing stone (countertops or tiles) when found in large quantities known as 'Blue Pearl' granite (anorthosite).

Geological facts

First discovered in Labrador, Canada, in 1770. It is famous for its 'Schiller effect' or labradorescence, which is caused by internal light reflections from sub-microscopic layers of exsolution lamellae within the feldspar structure.

Field identification & locations

Field identification is based on the distinct iridescent play of color when rotated under light. It is commonly found in Canada (Labrador), Madagascar, Russia, and Finland (where the high-quality variety 'Spectrolite' is found). Collectors look for 'full-flash' specimens with minimal fractures.