Experimental H₂ generation after Fe-rich mineral alteration in anoxia, depending on the temperature, and duration of experiment. Note that other experimental parameters may vary such as the reactive surface of the reactant, and water-rock ratio. Please note also that different experimental approaches have been used: *glass vial incubator, **gold flexible bag, ***gold capsule, ****batch reactor with inline sampling device. For further information on the methodology, refer directly to the respective studies (Geymond et al., 2023; Grozeva et al., 2017; McCollom et al., 2016; Milesi et al., 2015; Miller et al., 2017; Neubeck et al., 2011; Okland et al., 2014; Truche et al., 2021).