A review of the coordination chemistry of hydrothermal systems, or do coordination changes make ore deposits?

•A molecular-level understanding underpins accurate models of reactivetransport.•Changes in coordination geometry are associated with large changes in entropy.•Coordination changes occur rapidly with T, resulting in rapid changes in solubility.•Hydration and coordination geometry determine affinity for vapor transport.•A periodic table of hydrothermal coordination chemistry highlights geochemical trends.