mineral
Tumbled labradorite
Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectPolished gray stone with dark inclusions and reflective flashes; Mohs hardness 6–6.5, vitreous luster, triclinic crystals, two cleavages near 90°. The image shows limited blue-gray sheen, so identification is tentative.
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Physical properties
Polished gray stone with dark inclusions and reflective flashes; Mohs hardness 6–6.5, vitreous luster, triclinic crystals, two cleavages near 90°. The image shows limited blue-gray sheen, so identification is tentative.
Formation & geological history
Forms in igneous rocks, especially gabbro and anorthosite, as magma cools; these rocks range from ancient to geologically recent.
Uses & applications
Used for cabochons, beads, decorative objects, and architectural facing stone.
Geological facts
Its signature iridescence, called labradorescence, comes from light interference within fine internal layers of feldspar.
Field identification & locations
Common sources include Labrador, Canada, Madagascar, Finland, and Norway. Rotate under a bright light to look for vivid blue, green, or gold flashes; a small tumbled piece is typically worth about $2–$10.
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