mineral

Labradorite

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

Hardness: 6-6.5 Mohs; Color: Grey to dark grey with labradorescence (flashes of blue, green, yellow); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific Gravity: 2.68-2.72

Hardness: 6-6
Luster: Vitreous to pearly

Identified June 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro, and also found in some metamorphic rocks. Most notable deposits are in Labrador, Canada, and Madagascar, typically dating back to the Proterozoic or Archean eras.

Uses & applications

Used primarily in jewelry as gemstones (cabochons), as an ornamental stone in countertops and tiles, and widely collected as mineral specimens for its unique optical properties.

Geological facts

Labradorite is famous for its optical effect known as labradorescence, which is caused by light diffraction within internal lamellar intergrowths. Legend says the Northern Lights were once trapped inside Labradorite stones until a warrior struck them with a spear.

Field identification & locations

Identify in the field by rotating the specimen to catch the 'schiller' flash of color against a dull grey background. Commonly found in large plutonic bodies. Collectors should look for vibrant multi-color flashes and high transparency.