mineral

Labradorite

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

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.

Hardness: 6-6
Color: Gray to black with labradorescence (blue, green, gold)
Luster: Vitreous to pearly

Identified May 10, 2026More mineral →

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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.