Knowledge of the geochemical and biogeochemical composition and transformations of mineral dust from natural and anthropogenic sources is essential to understand its emissions, transport, fate, and interactions. This session encourages observational, modeling, laboratory, and theoretical studies utilizing geochemistry and biogeochemistry to understand the role of dust in the Earth system. Topics of interest include, for example (but not limited to): (1) nutrient loss, transport, and deposition through dust, (2) geochemical studies to show the chemical transformation of dust aerosols during transport, (3) [bio]geochemical techniques to understand sources and transport pathways of dust, (4) biogeochemistry of dust's role in ecosystems and atmospheric processes such as ice nucleation, (5) [bio]geochemical and isotopic fingerprints of dust, (6) adverse effects of chemical constituents of dust on ecosystem and human health, and (7) dust’s role in the critical zone and impacts on soil development and water quality.