mineral

Labradorite

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

Hardness: 6-6.5 Mohs scale; Color: Dark grey to black with labradorescence (blue, green, gold flashes); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72

Hardness: 6-6
Luster: Vitreous to pearly

Identified June 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt or gabbro through the slow cooling of magma. Significant deposits are often found in anorthosite massifs. Most famous deposits originated in the Proterozoic eon.

Uses & applications

Used primarily in jewelry (cabochons and beads), decorative ceramics, countertop slabs (for high-end construction), and as a popular collector's mineral.

Geological facts

Labradorite is named after the Labrador Peninsula in Canada, where it was first officially described in 1770. Its unique internal light reflection, caused by submicroscopic layers within the crystal structure, is scientifically termed 'labradorescence'.

Field identification & locations

Identify in the field by rotating the dark, dull-looking stone until a bright 'flash' of iridescent color appears. It is commonly found in Canada, Madagascar, Finland, and Norway. Collectors should look for 'schiller' or play-of-color.