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anorthite

[ an-awr-thahyt ]
/ ænˈɔr θaɪt /
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noun Mineralogy.

a white or gray feldspar mineral, CaAl2Si2O8, calcic plagioclase.

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Origin of anorthite

First recorded in 1825–35; an-1 + orth- + -ite1
an·or·thit·ic [an-awr-thit-ik], /ˌæn ɔrˈθɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for anorthite

anorthite
/ (ænˈɔːθaɪt) /

noun

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: CaAl 2 Si 2 O 8 . Crystal structure: triclinic
anorthitic (ˌænɔːˈθɪtɪk), adjective
C19: from 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

Scientific definitions for anorthite

anorthite
[ ăn-ôrthīt ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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