This application for beam time on TOSCA is a crucial component of a study into the dynamics, structure and reactivity of kaolinite and its dehydroxylation products. High-resolution INS measurements will be used to measure for the effects of dispersion of optical modes in this system. When combined with molecular dynamics simulations, these results will enable determination of the exact location and behaviour of OH groups in kaolinite. By studying samples with varying degrees of dehydroxylation, the changes in hydroxyl groups upon heating will be elucidated. The results from this INS analysis of kaolinite and its dehydroxylation products, coupled with DFT modelling, neutron and X-ray scattering and MD simulations, will provide the first ever integrated study of the structure, dynamics and reactivity of this highly industrially significant mineral and its derivatives.