mineral

Labradorite (Gray Feldspar)

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

Hardness: 6-6.5; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72

Hardness: 6-6
Color: Gray-green to dark gray
Luster: Vitreous to pearly

Identified May 25, 2026More mineral →

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Physical properties

Hardness: 6-6.5; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72

Formation & geological history

Formed through the crystallization of mafic igneous rocks like basalt or gabbro; often found in large plutonic masses. It is a plagioclase feldspar common in anorthosite.

Uses & applications

Primarily used as a semi-precious gemstone in jewelry, decorative ornaments, and occasionally as a high-end facing stone for architectural surfaces or countertops.

Geological facts

Labradorite is famous for its 'labradorescence,' an optical effect caused by internal lamellar structures that diffract light into flashes of blue, green, yellow, or orange.

Field identification & locations

Identify by looking for a play of colors (schiller effect) when the stone is tilted. It is commonly found in Canada (Labrador), Madagascar, Norway, and Finland.