mineral

Labradorite

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

Hardness: 6.0–6.5 Mohs; Color: Pale green, blue, colorless, or grey base with iridescent flashes of blue, gold, and green; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68–2.72.

Hardness: 6
Luster: Vitreous to pearly

Identified March 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks like basalt and gabbro through the slow cooling of magma. It belongs to the plagioclase feldspar series. Its unique iridescent effect, labradorescence, is caused by internal lamellar structures that diffract light as the mineral cools over geological time.

Uses & applications

Primary use is in jewelry (cabochons and beads), ornamental carvings, and high-end decorative building materials such as countertops or tiles. It is also a highly popular specimen for gemstone collectors.

Geological facts

Labradorite was first discovered in Labrador, Canada, in 1770. According to Inuit legend, the Northern Lights (Aurora Borealis) were once trapped within the rocks along the coast until a warrior struck them with a spear, releasing most of the lights into the sky while some remained in the stones.

Field identification & locations

Can be identified in the field by its distinct grey-green base color and 'schiller' effect or labradorescence when tilted under light. It is commonly found in Canada (Labrador), Madagascar, Finland (where it is known as Spectrolite), and Russia.