mineral

Labradorite

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

Hardness: 6-6.5 on Mohs scale; Color: Gray to dark gray base with iridescent blue, green, and gold flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68-2.72.

Hardness: 6-6
Luster: Vitreous to pearly

Identified March 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks like basalt and gabbro through the slow cooling of magma. It is an intermediate member of the plagioclase feldspar series. Many specimens originate from the Proterozoic era (appx. 1.3 billion years ago).

Uses & applications

Primarily used as a gemstone in jewelry (cabochons and beads) and as an ornamental stone in countertops, tiles, and high-end interior architecture. It is also highly prized by mineral collectors.

Geological facts

Displays a unique optical phenomenon called 'labradorescence,' which is caused by light reflecting off sub-microscopic layers of exsolution lamellae within the crystal. It was first discovered in Labrador, Canada, in 1770.

Field identification & locations

Identify in the field by rotating the specimen under a light source to search for hidden iridescent flashes (the schiller effect). Found commonly in Canada (Labrador), Madagascar, Finland, and Russia. Collectors should look for 'Spectrolite' variants from Finland for the highest color range.