When graphite is in extreme heats and pressure for a long period graphite turns into which minerals?

When graphite is subjected to extreme heat and pressure over long periods, it can transform into diamond. This process occurs in the Earth's mantle, where the intense conditions facilitate the reorganization of carbon atoms from the layered structure of graphite into the three-dimensional crystal lattice of diamond. This transformation highlights the unique properties and forms that carbon can take under varying geological conditions.