When granite is subjected to high temperature and pressure deep within the Earth without melting, it undergoes a process called metamorphism. This transforms the granite into a metamorphic rock.

The specific type of metamorphic rock formed depends on the intensity of the heat and pressure, the presence of fluids, and the original composition of the granite. Here are some possibilities:

* Gneiss: A common metamorphic rock formed from granite. It has a banded appearance due to the alignment of minerals under pressure.

* Schist: Another common metamorphic rock formed from granite. It has a layered or foliated texture, often with mica minerals.

* Hornfels: A non-foliated metamorphic rock, meaning it doesn't have a layered texture. It forms when granite is heated by nearby magma or lava.

Important Note: Even though the granite doesn't melt, the high temperature and pressure cause significant changes in its mineral composition, texture, and sometimes even its chemical composition.