Final answer:
During recrystallization, slow cooling allows for the formation of larger crystals.
Step-by-step explanation:
During recrystallization, the cooling process is important for the formation of larger crystals. Slow cooling allows for the individual crystals to have more time and space to grow, resulting in larger crystals. For example, feldspar crystallizes early in the cooling process at high temperatures, and its straight crystal sides are formed due to slow cooling. On the other hand, quartz crystallizes later and fills spaces created by slow cooling.