Large (~1-3 mm) olivine crystals were hand picked underneath a binocular microscope in order to avoid
grains with weathered surfaces or mineral inclusions. The un-weathered grains were crushed in an agate mortar and
pestle, dry sieved into different grain size fractions, and cleaned ultrasonically with ethanol in order to remove fine-
grained particles produced during grinding. Dissolution experiments were preformed in both batch and mixed flow
systems with a defined grain size of olivine (75-175 and varying concentrations (i.e. 0 – 280 of the
commercially available hydroxyamate siderophore deferoxamine. Batch experiments were buffered to a pH of ~7.5
with a TRIS/HCl buffer (10 mM) and reacted at 30°C in an incubated shaking table that kept the solutions well
mixed by rotating at 200 rpm for the duration of the experiments. The batch experiments were sampled regularly for
up to 40 hours and analyzed for Mg, Fe, and Si concentrations by MP-OES after acidification with concentrated
HCl.