noun
a type of metamorphic rock that has a banded or foliated appearance
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The gneiss rock formation in the mountains is a result of intense heat and pressure over millions of years.
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Check out the cool gneiss patterns on this rock, it's like nature's artwork!
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That gneiss rock is so rad, I want to take a selfie with it!
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Her personality is like a gneiss rock - strong, resilient, and beautiful in its own unique way.