migmatite

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mig·ma·tite

 (mĭg′mə-tīt′)
n.
A rock of both metamorphic and igneous origin that exhibits characteristics of both rock types and probably forms through the heating but not melting of rocks in the presence of abundant fluids.

[Greek migma, migmat-, mixture (from mignunai, to mix; see meik- in Indo-European roots) + -ite.]

migmatite

(ˈmɪɡməˌtaɪt)
n
(Geological Science) 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]