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When during metamophism of granite into gneiss, what happens to minerals?

April 26, 2017gneiss granite happens minerals

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When during metamophism of granite into gneiss, what happens to minerals?

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With the extreme heat and pressure causing the metamorphism into gneiss, the constituent minerals recrystallize into bands, usually alternating from light colored to dark, perpendicular to the direction of the pressure which is being applied.