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| gneiss [ nīss ] |
noun |
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| Definition: |
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coarse layered rock: a coarse-grained high-grade metamorphic rock formed at high pressures and temperatures, in which light and dark mineral constituents are segregated into visible bands
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| [Mid-18th century. < German] |
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 gneiss·ic adjective |
| gneiss·ose adjective |
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