anorthositic

Science Dictionary
anorthosite   (ān-ôr'thə-sīt')  Pronunciation Key 
An igneous rock consisting almost entirely of plagioclase feldspar, especially the labradorite variety. Anorthosites have been identified among rock samples collected from the Moon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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