mineral

Labradorite

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

Hardness: 6-6.5 Mohs scale; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Displays labradorescence (schiller effect).

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

Identified June 3, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs scale; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Displays labradorescence (schiller effect).

Formation & geological history

Forms in mafic igneous rocks such as basalt and gabbro, as well as in anorthosites. It is formed through the crystallizing of magma or lava and is common in the Precambrian age.

Uses & applications

Primarily used for ornamental purposes, gemstone jewelry, interior design (countertops), and as a collector's specimen.

Geological facts

Labradorite is named after the Labrador Peninsula in Canada where it was first identified in 1770. The vibrant play of color it displays is caused by internal fractures that reflect light back and forth.

Field identification & locations

Look for the metallic-looking flashes of blue, green, or gold color when the stone is rotated under a light source. Commonly found in Canada, Madagascar, and Finland (where it is called Spectrolite).