Science Dictionary
anorthoclase   (ān-ôr'thə-klās')  Pronunciation Key 
A white to colorless triclinic mineral of the alkali feldspar group. It is a common constituent in the matrices of slightly alkaline volcanic rocks. Chemical formula: (Na,K)AlSi3O8.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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