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[lab-ruh-daw-rahyt, lab-ruh-dawr-ahyt] /ˈlæb rə dɔˌraɪt, ˌlæb rəˈdɔr aɪt/
a feldspar mineral of the plagioclase group, often characterized by a brilliant change of colors, with blue and green most common.
Origin of labradorite
1805-15; named after Labrador, where first discovered; see -ite1
Related forms
[lab-ruh-daw-rit-ik] /ˌlæb rə dɔˈrɪt ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for labradorite
  • Small snow-white plagioclase phenocrysts of sodic labradorite are characteristic.
  • The material for the exterior walls is a form of crushed concrete and labradorite which has been cast, cut, ground and polished.
  • Most crystals are andesine, but the composition ranges from oligoclase to labradorite.
  • Gabbro consists of folded layers of alternating labradorite-rich gabbro and hornblende or augite-rich rock.
British Dictionary definitions for labradorite


a blue, green, or reddish-brown feldspar mineral of the plagioclase series: used as a decorative stone. Formula: CaAl2Si2O8.NaAlSi3O8
Word Origin
C18: named after Labrador, where it was found; see -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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labradorite in Science
  (lāb'rə-dôr'īt', -dô-rīt')   
A blue, gray, green, or brown triclinic mineral that is a variety of plagioclase feldspar. It occurs in igneous rocks.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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