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During the last 4 years research in the elastic properties of minerals has been focused on several major areas: (1) measurement of the pressure and temperature dependence of the elastic properties of the minerals that are primary constituents of earth-forming rocks; (2) measurement of the ambient properties of additional natural minerals and rocks; (3) study of the effect of rock fabric, porosity, and fluid content on the elastic properties of poly crystalline aggregates; (4) development of new experimental techniques to enable measurement at high temperature and at high pressure simultaneously and to measure velocities in natural rocks more precisely; (5) establishment of systematic trends in the data that lead to the formulation of a semiempirical equation of state relating the zero-pressure elastic properties of minerals. In this brief report, we attempt only to highlight the major advances that have been made in these areas. The reader is referred to the bibliography for further details.