Rock Identifier
Labradorite (Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8) — mineral
mineral

Labradorite

Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8

Hardness: 6.0–6.5 (Mohs scale); Color: Pale green, blue, colorless, grey-white; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68 to 2.76. It is famous for its labradorescence, a schiller effect caused by internal light reflections.

Hardness
6
Color
Pale green, blue, colorless, grey-white
Luster
Vitreous to pearly
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Physical properties

Hardness: 6.0–6.5 (Mohs scale); Color: Pale green, blue, colorless, grey-white; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68 to 2.76. It is famous for its labradorescence, a schiller effect caused by internal light reflections.

Formation & geological history

Formed in mafic igneous rocks such as basalt and gabbro through the crystallization of magma. It is also found in some metamorphic rocks and anorthosites. It is often associated with the Proterozoic Era (approx. 1 billion years ago) in specific massifs.

Uses & applications

Primarily used in jewelry as gemstones (cabochons or beads), decorative architecture (countertops and tiles), and as a mineral specimen for metaphysical collection.

Geological facts

Labradorite was first discovered in Labrador, Canada, in 1770. Inuit legends say the Northern Lights (Aurora Borealis) were once trapped inside the rocks along the coast until a warrior struck them with a spear, releasing most of the light but leaving some behind in the stones.

Field identification & locations

Identify in the field by looking for a dark-colored, stony luster that flashes vibrant metallic blues, greens, or golds (labradorescence) when rotated under light. Common locations include Canada (Labrador), Madagascar, Finland (Spectrolite variety), and Norway.

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