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This paper reports a study, performed by in-situ synchrotron X-ray Powder Diffraction,\udof the high pressure behavior of the natural zeolite amicite [K4 Na4 (Al8 Si8 O32 )·10H2 O], the GIS-type\udphase with ordered (Si, Al) and (Na, K) distribution. The experiments were carried out up to\ud8.13(5) GPa in methanol:ethanol:water = 16:3:1 (m.e.w.) and 8.68(5) GPa in silicone oil (s.o.).\udThe crystal structure refinements of the patterns collected in m.e.w. were performed up to\ud4.71(5) GPa, while for the patterns collected in s.o. only the unit cell parameters were determined\udas a function of pressure. The observed framework deformation mechanism—similar to that\udreported for the other studied phases with GIS topology—is essentially driven by the distortion\udof the “double crankshaft” chains and the consequent changed shape of the 8-ring channels.\udThe pressure-induced over-hydration observed in the experiment performed in aqueous medium\udoccurs without unit cell volume expansion, and is substantially reversible. A comparison is made with\udthe high pressure behavior of the other GIS-type phases, and the strong influence on compressibility\udof the chemical composition of both framework and extraframework species is discussed

The Influence of the Framework and Extraframework Content on the High Pressure Behavior of the GIS Type Zeolites: The Case of Amicite