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anorthosite

[an-awr-thuh-sahyt]
noun Petrology.
  1. a granular plutonic rock composed largely of labradorite or a more calcic feldspar.
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Origin of anorthosite

1860–65; < French anorthose anorthoclase (an- an-1 + Greek orthós straight) + -ite1
Related formsan·or·tho·sit·ic [an-aw-thuh-sit-ik] /ænˌɔ θəˈsɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for anorthosite

Historical Examples of anorthosite

  • In Canada great portions of the eastern portion of the Dominion are formed of gabbros, norite, anorthosite and allied rock types.

    Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4

    Various


British Dictionary definitions for anorthosite

anorthosite

noun
  1. a coarse-grained plutonic igneous rock consisting almost entirely of plagioclase feldspar
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Word Origin for anorthosite

C19: from French anorthose (see an-, ortho-) + -ite 1
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

anorthosite in Science

anorthosite

[ăn-ôrthə-sīt′]
  1. An igneous rock consisting almost entirely of plagioclase feldspar, especially the labradorite variety. Anorthosites have been identified among rock samples collected from the Moon.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.