| Abstract
| - Neutron powder diffraction data were collected on a sample of natrolite and a 1:1 (v/v) mixture of perdeuteratedmethanol and water at a pressure of 1.87(11) GPa. The natrolite sample was superhydrated, with a watercontent double that observed at ambient pressure. All of the water deuterium atoms were located and thenature and extent of the hydrogen bonding elucidated for the first time. This has allowed the calculation ofbond valence sums for the water oxygen atoms, and from this, it can be deduced that the key energetic factorleading to loss of the additional water molecule upon pressure release is the poor coordination to sodiumcations within the pores.
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