mineral

Labradorite

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

Hardness: 6.0-6.5 on Mohs scale; Color: Gray to black with labradorescence (blue, green, gold flashes); Luster: Vitreous to Pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions.

Hardness: 6
Luster: Vitreous to Pearly

Identified April 4, 2026More mineral →

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Physical properties

Hardness: 6.0-6.5 on Mohs scale; Color: Gray to black with labradorescence (blue, green, gold flashes); Luster: Vitreous to Pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions.

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro, and also found in anorthosite. It crystallizes from magma and develops internal lamellar structures during slow cooling.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons, beads), decorative carvings, and occasionally as a facing stone in high-end construction/architecture.

Geological facts

The unique play of color is known as 'labradorescence,' caused by internal diffraction from thin layers within the crystal. It was first discovered in Paul's Island, Labrador, Canada in 1770.

Field identification & locations

Identify by rotating the stone in light to look for 'schiller' or iridescent flashes. Common locations include Canada (Labrador), Madagascar, Norway, and Finland (Spectrolite variety).

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