When heat and pressure are applied to granite, it transforms into a metamorphic rock called gneiss.

Here's how it works:

* Granite: Granite is an igneous rock composed of quartz, feldspar, and mica.

* Metamorphism: When granite is subjected to intense heat and pressure deep within the Earth's crust, its minerals recrystallize and realign.

* Gneiss: This process results in a metamorphic rock with a distinct banded or layered appearance, due to the alignment of minerals like mica and feldspar.

So, the answer is gneiss.