Labradorite

Physical Properties

Mohs Hardness: 6-6.5; Color: Gray to black with labradorescence (blue, green, gold); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.

Formation & Geological History

Forms primarily in mafic igneous rocks such as basalt and gabbro through the slow cooling of magma. It is part of the plagioclase feldspar series.

Uses & Applications

Used extensively in jewelry, ornamental carvings, architectural tiles (Blue Pearl granite), and internal decor for its unique optical properties.

Geological Facts

Displays a unique schiller effect called labradorescence, caused by internal light reflections from submicroscopic layers of exsolution lamellae within the crystal.

Field Identification & Locations

Identified by tilting the specimen to catch the metallic-looking 'flash' of iridescent colors. Commonly found in Labrador (Canada), Madagascar, Finland, and Russia.

Identified on: 5/10/2026

Mode: Standard