mineral
Polished labradorite (likely)
Labradorite, a plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectTumbled, smooth stone with a gray-brown body and golden iridescent flash (labradorescence). Hardness 6–6.5 Mohs; vitreous luster and triclinic crystal structure. The photo alone cannot confirm the identification.
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Physical properties
Tumbled, smooth stone with a gray-brown body and golden iridescent flash (labradorescence). Hardness 6–6.5 Mohs; vitreous luster and triclinic crystal structure. The photo alone cannot confirm the identification.
Formation & geological history
Forms in igneous rocks, especially gabbro and anorthosite, as magma cools; specimens occur in rocks of varied ages. The shimmer results from light interference in fine internal feldspar layers.
Uses & applications
Used for beads, cabochons, jewelry, and decorative objects; also collected as a display mineral.
Geological facts
Labradorite is named for Labrador, Canada, where it was described; similar feldspars include spectrolite and bytownite.
Field identification & locations
Look for shifting blue, green, or gold flashes as the stone is tilted, often against a gray base. Notable sources include Canada, Madagascar, Finland, and Norway.
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