Gneiss forms by the recrystallization of unmelted rock material under conditions of high temperature and pressure.
Metamorphic rocks form as a result of recrystallization of unmelted material under conditions of high temperature and pressure over a very long period of time.
Metamorphic rocks can also be formed from the transformation of existing rock to new rock.
Examples of metamorphic rocks include schist, gneiss, quartzite and marble.
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