Explore the elastic anisotropy and phase transitions in the Earth's upper mantle through a 25-minute talk by Jin Zhang from the University of New Mexico. Delivered as part of the Mineralogical Society of America's Centennial Symposium, this presentation focuses on synchrotron-based studies of high-pressure mineral behavior. Delve into topics such as physical properties, experimental setups, program spectroscopy, mineral phases, diffraction, elastic properties, and density. Gain insights into the importance of these studies and their implications for understanding the Earth's interior structure and dynamics.