mineral
Labradorite (rough specimen)
Labradorite, a plagioclase feldspar in the labradorite–bytownite series; approximately (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectMohs hardness 6–6.5; gray to brown with a vitreous luster and possible blue-green iridescent flashes (labradorescence). Triclinic crystal structure; two good cleavage directions, nearly at right angles.
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Physical properties
Mohs hardness 6–6.5; gray to brown with a vitreous luster and possible blue-green iridescent flashes (labradorescence). Triclinic crystal structure; two good cleavage directions, nearly at right angles.
Formation & geological history
Forms as crystals in cooling mafic igneous rocks, especially gabbro and anorthosite; its age depends on the host rock and local geology.
Uses & applications
Polished for cabochons, beads, and decorative objects; feldspar is also used in ceramics and glassmaking.
Geological facts
Its vivid color flash comes from light interference within fine internal layers of feldspar.
Field identification & locations
Common sources include Canada, Finland, Madagascar, and Norway. Look for gray feldspar that shows shifting flashes when tilted under a light; the photo is consistent with rough labradorite, though color play is not clearly visible.
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