[ an-awr-thahyt ]
/ ænˈɔr θaɪt /

noun Mineralogy.

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

Origin of anorthite

First recorded in 1825–35; an-1 + orth- + -ite1


an·or·thit·ic [an-awr-thit-ik] /ˌæn ɔrˈθɪt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for anorthite

British Dictionary definitions for anorthite

/ (ænˈɔːθaɪt) /


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

Derived forms of anorthite

anorthitic (ˌænɔːˈθɪtɪk), adjective

Word Origin for anorthite

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

[ 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.