Supplementary Information for Manuscript "Thermodynamic Constraints on H2 Production and Habitability from Mg-rich Serpentinites as Mars Analogs"

Included here are data tables S1-S8 presenting XRF data calibration parameters, field derived mineral and elemental abundances, statistical analysis results, gas concentrations alongside biomass estimates, as well as Fig. S1 presenting elemental abundances for minor elements and mobile/immobile elemental ratios, and Fig. S2 presenting O2(aq) variability in minerology for Nisson et al., 2026.