migmatite

World English Dictionary
migmatite (ˈmɪɡməˌtaɪt)
 
n
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
 
[C20: alteration of Swedish migmatit, from Greek migma mixture + -ite1]

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American Heritage
Science Dictionary
migmatite   (mĭg'mə-tīt')  Pronunciation Key 
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
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