mineral

Labradorite (Feldspar)

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

Hardness: 6-6.5 (Mohs scale); Color: Gray to black with labradorescence (blue/green/gold flashes); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.

Hardness: 6-6
Color: Gray to black with labradorescence (blue/green/gold flashes)
Luster: Vitreous to pearly

Identified April 6, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs scale); Color: Gray to black with labradorescence (blue/green/gold flashes); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro, and sometimes in metamorphic rocks. It crystallizes from cooling magma where the cooling rate allows for microscopic exsolution lamellae that cause its unique optical effect.

Uses & applications

Predominantly used as a gemstone in jewelry, for ornamental carvings, and as a sought-after specimen for mineral collectors. Some high-grade varieties are used as architectural stone counter-tops.

Geological facts

Labradorite is famous for its 'schiller' effect, specifically called labradorescence. It was first discovered in Labrador, Canada, in 1770. According to Inuit legend, the Northern Lights were trapped inside the rocks until a warrior struck them with a spear.

Field identification & locations

Identify in the field by rotating the specimen in light to look for hidden flashes of color (blue, green, yellow). It is commonly found in Canada (Labrador), Madagascar, Finland (Spectrolite), and Russia. Its cleavage and hardness help distinguish it from quartz or glass.

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