gneiss Definition in the Cambridge English Dictionary
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Definition of “gneiss” - English Dictionary

Definition of "gneiss" - British English Dictionary

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gneissnoun [U]

uk   us   /naɪs/ specialized
a ​type of metamorphicrock that ​containslight and ​darklayersformed of ​minerals such as quartz and mica
(Definition of gneiss from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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