Many minerals contain water, primarily in the form of molecular H2O or as hydroxyl OH groups. The bonding characteristics of H can influence properties, such as electrical conductivity, compressibility and, in a wider context, mineral stability as a function of pressure, temperature and composition. Of particular interest geologically is the ability of mantle minerals to act as a significant reservoir for water. Over the past three decades a new picture has emerged of the distribution of water (H2O and OH) in the Earth. The main water budget is no longer found to be restricted to the...

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