igneous
Polished labradorite
Labradorite, a plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)
AI-generated identification · may be incorrectMohs hardness 6–6.5; blue-green and gray mottling with a subdued sheen. Triclinic crystals; two cleavages near 90°, specific gravity about 2.7. The image shows a shaped, polished pebble; no strong labradorescence is visible.
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Physical properties
Mohs hardness 6–6.5; blue-green and gray mottling with a subdued sheen. Triclinic crystals; two cleavages near 90°, specific gravity about 2.7. The image shows a shaped, polished pebble; no strong labradorescence is visible.
Formation & geological history
Labradorite crystallizes in slowly cooled, calcium-rich igneous rocks, especially gabbro and anorthosite. Such rocks form in magma bodies, often billions of years old.
Uses & applications
Used for ornamental stone, beads, cabochons, and decorative architectural surfaces.
Geological facts
Its characteristic iridescent flash, called labradorescence, results from light interference within microscopic layers in the feldspar.
Field identification & locations
Common sources include Labrador, Canada; Finland; Madagascar; and Norway. Identify it by feldspar-like hardness and, when present, shifting blue, green, or gold flashes as the stone is tilted.
