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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 a form of metamorphic rock consisting of light and dark silicates, due to which it has an appearance of banding. It can be formed from diorite or granite combined wi â¦ th a number of minerals, bonded to it at extremely high temperatures (e.g