mineral

Labradorite

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

Hardness: 6.0-6.5 on Mohs scale; Color: Gray to black with labradorescence (blue, green, gold flashes); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68 to 2.72.

Hardness: 6
Luster: Vitreous to pearly

Identified March 12, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks like basalt and norite through the crystallization of magma. It is a member of the plagioclase feldspar series. Notable occurrences are found in Precambrian metamorphic and igneous complexes.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons and beads) and as an ornamental stone in architecture (countertops and tiles). It is also highly valued by mineral collectors for its optical properties.

Geological facts

Labradorite is famous for its 'schiller' effect or 'labradorescence,' which is caused by light reflecting off microscopic layers of exsolution lamellae within the crystal. It was first discovered in Paul's Island, Labrador, Canada in 1770.

Field identification & locations

Identify in the field by rotating the stone in the light to check for a sudden 'flash' of iridescent color. It is commonly found in Canada (Labrador/Newfoundland), Madagascar, Finland, and Russia.