The H2O molecule plays a fundamental role in geologic and biomineralogical processes. Indeed, much effort is being invested, for example, in studying the nature of various fluid-geomaterial interactions and biological-geological processes. In order to obtain a fundamental scientific understanding of such complex processes, a prerequisite is first, that the physical nature of the H2O-molecule system is understood. There are a large number of studies that have been published on the system H2O and the behavior of the H2O molecule in various chemical and physical environments. In terms of Earth Science related questions, it is necessary to investigate further how the H2O molecule interacts with a variety of geomaterials.