Material properties are dependent upon atomic arrangement. The structure provides a basis for calculation and for the interpretation of experiment. In the Earth context, mineral structure is composition, pressure and temperature sensitive, and changes in the phases present cause profound changes in properties. Examples include the relationship between sound velocities (elasticity) and structure as a function of depth in the Earth (Chen et al. 1999, Li et al. 1998, Liebermann and Li 1998, Parise et al. 1998). The selective sorption of ions and isotopes on mineral surfaces, and on particular faces on one growing surface,...

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