mineral
Likely polished labradorite (small tumbled stone)
Labradorite, a plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectGray-brown with a muted golden-blue sheen consistent with labradorescence; vitreous luster, triclinic crystals, Mohs hardness 6–6.5, and two cleavage directions. The photo is dim, so identification is uncertain.
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Physical properties
Gray-brown with a muted golden-blue sheen consistent with labradorescence; vitreous luster, triclinic crystals, Mohs hardness 6–6.5, and two cleavage directions. The photo is dim, so identification is uncertain.
Formation & geological history
Forms as calcium-sodium feldspar in cooling igneous rocks, especially anorthosite and gabbro; deposits occur in Canada, Madagascar, Finland, and elsewhere. Its age depends on the host rock.
Uses & applications
Used for polished specimens, beads, cabochons, and decorative stone; feldspar is also an important industrial raw material.
Geological facts
Labradorescence is produced by light interference within microscopic, layered structures in the feldspar.
Field identification & locations
Rotate it under a bright light: labradorite typically flashes blue, green, or gold across otherwise subdued gray surfaces. A photograph alone cannot confirm the mineral.
