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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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


migmatite

/ mĭgmə-tīt′ /

  1. 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.
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Word History and Origins

Origin of migmatite1

C20: alteration of Swedish migmatit, from Greek migma mixture + -ite 1

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