mineral

Labradorite

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

Hardness: 6.0-6.5; Color: Dark grey to grey-black with labradorescence (blue, green, gold flashes); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.68-2.72

Hardness: 6
Luster: Vitreous to pearly

Identified May 16, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro, Labradorite is a plagioclase feldspar that crystallizes from cooling magma. Its unique optical effect is caused by internal lamellar structures that diffract light.

Uses & applications

Primarily used as a gemstone in jewelry, decorative carvings, and polished display pieces. In larger slabs, it is used for high-end countertops or architectural cladding.

Geological facts

Labradorite was first discovered in Labrador, Canada, and according to Inuit legend, the Northern Lights (Aurora Borealis) were trapped inside the rocks until a warrior struck them with a spear.

Field identification & locations

Identified in the field by its characteristic labradorescence (schiller effect) which appears as flashes of color when the stone is tilted. Commonly found in Canada, Madagascar, Norway, and Finland.