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Definition of gneiss - a metamorphic rock with a banded or foliated structure, typically coarse-grained and consisting mainly of feldspar, quartz, and mi Definition of gneiss - a metamorphic rock with a banded or foliated structure, typically coarse-grained and consisting mainly of feldspar, quartz, and mi dictionary thesaurus
Gneiss-a coarse grained metamorphic rock. Gossan-the product of the weathering of a sulfide rock or ore body. Granulite-a high grade metamorphic rock formed from basalt; also a facies of metamorphic rocks. Greenschist-a mafic metamorphic rock dominated by green amphiboles.