Infrared spectra of the OH stretching region for natural kaolinite and synthetic ordered aluminous serpentine were recorded between 100 and 9400 bars helium pressure at room temperature. Kaolinite showed an increase of about +0.5 cm−1w/kbar for two major stretch frequencies while the aluminous serpentine indicated almost constant energy of vibration for the inner and a −1.7 cm−1/kbar value for the surface hydroxyl vibration. We suggest that this negative shift with pressure is due to an increase in hydrogen bonding between the layers of the structure and thus an increase in O–H distance of the outer hydroxyl groups.

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