Labradorite

Physical Properties

Hardness: 6-6.5 on Mohs scale. Color: Pale green, blue, colorless, or grey. Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect and good. Specific gravity: 2.68 to 2.72. Features labradorescence (iridescence).

Formation & Geological History

Formed in mafic igneous rocks such as basalt and gabbro, and sometimes found in metamorphic rocks. It crystallizes from magma in deep-seated environments. Notable deposits range from Precambrian to more recent geological ages.

Uses & Applications

Primarily used in jewelry for cabochons and beads, as an ornamental stone for Countertops and tiles, and as a popular specimen for crystal collectors.

Geological Facts

Named after Labrador, Canada, where it was discovered in 1770. The unique play of color is caused by the interference of light reflecting off microscopic lamellae (layers) within the mineral.

Field Identification & Locations

Identify in the field by rotating the specimen in the light to observe the labradorescence effect. Commonly found in Labrador (Canada), Madagascar, Norway, and Finland (where high-quality specimens are called Spectrolite).

Identified on: 5/7/2026

Mode: Standard