Properties of minerals at extreme pressure and temperature are essential for understanding planetary interiors. The recent discovery of extrasolar planets opens new questions about possible planetary architectures motivating the exploration of a broader range of internal pressure-temperature states. In the laboratory, dynamic compression techniques using high-powered lasers, pulsed-power systems, and light-gas guns provide unprecedented experimental access to the extreme pressure-temperature regime of planetary interiors. Theoretical investigations using ab initio electronic structure methods provide complementary ways of elucidating the properties of matter. This session welcomes contributions spanning experiment and theory that address the properties of planetary materials under extreme conditions and the application of these results to next-generation models of the formation, interior structure, and evolution of giant planets.