mineral

Labradorite

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

Hardness: 6-6.5 on Mohs scale; Color: Gray to black with blue, green, or yellow iridescent flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68-2.72

Hardness: 6-6
Color: Gray to black with blue, green, or yellow iridescent flashes
Luster: Vitreous to pearly

Identified May 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms in mafic igneous rocks such as basalt and gabbro, as well as some metamorphic rocks. Most famous deposits are from the Anorthosite complex in Labrador, Canada, formed during the Proterozoic eon.

Uses & applications

Primarily used as a semi-precious gemstone in jewelry, ornamental carvings, and high-end architectural countertops or tiles.

Geological facts

The iridescent optical effect is known as labradorescence, caused by light diffracting between microscopic layers of tilted crystals known as lamellae. Some Inuit legends say the Northern Lights were trapped inside these stones.

Field identification & locations

Identify by rotating it under a light source to reveal the internal 'flash' of color. Often found in Labrador (Canada), Finland, Madagascar, and Russia. Look for dark, dull rocks that suddenly display vibrant blues or greens when tilted.