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[an-awr-thahyt] /ænˈɔr θaɪt/
noun, Mineralogy.
a white or gray feldspar mineral, CaAl 2 Si 2 O 8 , calcic plagioclase.
Origin of anorthite
First recorded in 1825-35; an-1 + orth- + -ite1
Related forms
[an-awr-thit-ik] /ˌæn ɔrˈθɪt ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for anorthite


a white to greyish-white or reddish-white mineral of the feldspar group and plagioclase series, found chiefly in igneous rocks and more rarely in metamorphic rocks. It is used in the manufacture of glass and ceramics. Composition: calcium aluminium silicate. Formula: CaAl2Si2O8. Crystal structure: triclinic
Derived Forms
anorthitic (ˌænɔːˈθɪtɪk) adjective
Word Origin
C19: from an- + ortho- + -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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anorthite in Science
A white to gray triclinic mineral of the plagioclase feldspar group. Anorthite is the plagioclase mineral that is richest in calcium and occurs in alkaline igneous rocks such as gabbro. Chemical formula: CaAl2Si2O8.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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