anorthite

[an-awr-thahyt]

noun Mineralogy.

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

Nearby words

Origin of anorthite

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

Related formsan·or·thit·ic

[an-awr-thit-ik] /ˌæn ɔrˈθɪt ɪk/, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for anorthite

Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4|Various
Anorthite is an essential constituent of many basic igneous rocks, such as gabbro and basalt, also of some meteoric stones.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2|Various
Rougemonite consists largely of anorthite with pyroxene as the only important ferro-magnesian constituent.
Montreal 1535-1914 under the French Rgime|William Henry Atherton

British Dictionary definitions for anorthite

anorthite

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

Derived Formsanorthitic (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

Science definitions for anorthite

anorthite

[ăn-ôr′thīt]

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.