Labradorite

Physical Properties

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

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.

Identified on: 5/16/2026

Mode: Standard