anorthite

[an-awr-thahyt]
noun Mineralogy.
a white or gray feldspar mineral, CaAl 2 Si 2 O 8 , calcic plagioclase.

Origin:
1825–35; an-1 + orth- + -ite1

anorthitic [an-awr-thit-ik] , adjective
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Collins
World English Dictionary
anorthite (ænˈɔːθaɪt)
 
n
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
 
[C19: from an- + ortho- + -ite1]
 
anorthitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
anorthite   (ān-ôr'thīt)  Pronunciation Key 
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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Example sentences
The variety of plagioclase richest in sodium is known as albite, while the type wholly lacking in sodium is called anorthite.
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