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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 is sometimes named for these minerals, examples of which include garnet gneiss and biotite gneiss. Garnet Gneiss: A coarse-grained gneiss composed mainly of hornblende (black), plagioclase (white), and garnet (red) from Norway.