mineral

Labradorite

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

Hardness: 6-6.5 (Mohs), Color: Dark gray to gray-black with iridescent flashes (labradorescence), Luster: Vitreous to pearly, Crystal Structure: Triclinic, Cleavage: Perfect in two directions, Specific Gravity: 2.68-2.72

Hardness: 6-6

Identified April 6, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in mafic igneous rocks like basalt and gabbro through the slow cooling of magma. It belongs to the plagioclase feldspar series. Notable deposits are found in Precambrian rock formations.

Uses & applications

Extensively used in jewelry (cabochons, beads), decorative carvings, high-end countertops (Larvikite varieties), and as a popular collector's specimen for its metaphysical appeal.

Geological facts

Named after the Labrador peninsula in Canada where it was discovered in 1770. The iridescent play of color, called labradorescence, is caused by internal lamellar structures that diffract light.

Field identification & locations

Identified by tilting the stone to catch 'flashes' of blue, green, or gold. Commonly found in Canada, Madagascar, Norway, and Finland. Collectors should look for vibrant color play and lack of large cracks.