mineral

Labradorite

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

Hardness: 6.0-6.5; Color: Dark grey to grey-black with iridescent flashes of blue, green, and gold; 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 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro, often cooling slowly to allow for exsolution lamellae that create its optical effect. Notable deposits date back to the Proterozoic era, particularly in anorthosite massifs.

Uses & applications

Used primarily in jewelry as cabochons or beads, as a decorative architectural stone (countertops and tiles), and as a popular specimen for crystal collecting and metaphysical practices.

Geological facts

The shimmering effect is called 'labradorescence,' caused by internal light scattering off sub-microscopic layers. It was first officially discovered by missionaries in Paul's Island, Labrador, Canada, in 1770.

Field identification & locations

Identify in the field by rotating the specimen to catch the 'schiller' or metallic-like flashes of color. Commonly found in Labrador (Canada), Madagascar, Finland (where it is called Spectrolite), and Russia.

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