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migmatite

/ˈmɪɡməˌtaɪt/
noun
1.
a composite rock body containing two types of rock (esp igneous and metamorphic rock) that have interacted with each other but are nevertheless still distinguishable
Word Origin
C20: alteration of Swedish migmatit, from Greek migma mixture + -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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migmatite in Science
migmatite
  (mĭg'mə-tīt')   
A rock of both metamorphic and igneous origin, that exhibits characteristics of both rock types. Migmatites probably form through the heating (but not melting) of rocks in the presence of abundant fluids.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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