Zeolite under pressure: Super-hydrated zeolite, K16Al16Si24O80⋅32 H2O, undergoes a unique transformation above 2.5 GPa whereby the potassium ions interchange their locations with those of water, whereas the elliptical channel reverts its major–minor axes, resembling a “chatterbox motion” (see graphic). Alkali-metal-exchanged natrolites under pressure reveal structural changes that far exceed what can be achieved by varying temperature and chemical composition