Labradorite definitions

lăb'rə-dôr'īt', -dô-rīt'
A usually brilliant blue or green variety of plagioclase feldspar that contains approximately equal proportions of sodium and calcium and occurs in silica-poor igneous rocks.
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A variety of plagioclase with dark, iridescent colors.
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A blue, gray, green, or brown triclinic mineral that is a variety of plagioclase feldspar. It occurs in igneous rocks.
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(mineralogy) A plagioclase feldspar mineral, calcium sodium aluminum silicate, often very coarsely crystalline, used as a decorative stone for carvings and building façades.
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Origin of labradorite

After the Labrador (Peninsula)