Crystallization is the process by which solids form when atoms or molecules are organized into a crystal structure. The resulting crystal's attributes depend on factors like temperature, air pressure, cooling rate, and time of fluid evaporation. copper (II) sulphate pentahydrate (CuSO4⋅5H2O) can be obtained from an aqueous solution of copper (II) tetraoxosulphate (VI) by crystallization.