Explore a 50-minute conference talk from the 2014 AGU Fall Meeting that delves into three cases where mineral thermochemistry advances provide new insights into geological processes. Examine how Sb-rich fahlores constrain hydrothermal fluid compositions in Ag-Pb-Zn sulfide ores from three mining districts, investigate the potential condensation of Al8/3O4-rich spinels from the primordial solar nebula, and analyze fassitic pyroxenes in Ca-Al-rich inclusions (CAIs) to understand their implications for CAI petrogenesis and refinements to thermochemical models.