igneous
Polished labradorite
Labradorite, a plagioclase feldspar in the albite–anorthite series (approximately (Ca,Na)(Al,Si)₄O₈)
AI-generated identification · may be incorrectGray to blue-gray, polished, with pale blue iridescence (labradorescence) and visible cleavage; hardness 6–6.5 Mohs, vitreous luster, triclinic crystals, specific gravity about 2.7. The image is consistent with labradorite, though a photo cannot confirm the identification.
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Physical properties
Gray to blue-gray, polished, with pale blue iridescence (labradorescence) and visible cleavage; hardness 6–6.5 Mohs, vitreous luster, triclinic crystals, specific gravity about 2.7. The image is consistent with labradorite, though a photo cannot confirm the identification.
Formation & geological history
Forms as a calcium-rich plagioclase in cooling igneous rocks, especially gabbro and anorthosite. Labradorite-bearing rocks occur across a wide range of geological ages.
Uses & applications
Used for jewelry, polished ornamental objects, and decorative architectural stone; attractive flash increases collector appeal.
Geological facts
Its blue sheen results from light interference within microscopic layers in the feldspar, not from a surface coating.
Field identification & locations
Look for gray feldspar with blue, green, or gold flashes that shift with viewing angle; major sources include Labrador, Canada, Madagascar, Finland, and Norway. Typical small polished specimens: about $5–$30 USD, depending on flash, size, and workmanship.
