This gave m values of 42±4 and 47±6 for the pristine and hydrated glass, respectively. This is in the same as many modified oxide and metallic glass-forming systems (m≈30-70), but considerably lower than most organic systems and higher than the hybrid ZIF-62 (m=23) as well as pure SiO2 (m=20) . We note that assigning a structural origin to these differences in fragility is challenging, given that fragility is determined by the temperature derivative of atomic degrees of freedom.