migmatite

noun

mig·​ma·​tite

ˈmigməˌtīt

plural -s

: a gneiss produced by the injection of igneous material between the laminae of a schistose formation

called also injection gneiss

Word History

Etymology

Late Latin migmat-, migma mixture (from Greek, from meignynai, mignynai to mix) + English -ite

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