Total Fe contents (FeT, wt%), the fraction of Fe2+ in magnetite (Fe2+Mag, %), the fraction of Fe atoms in magnetite relative to total Fe atoms in the bulk sample (FeMag, %), and the proportion of magnetite in the bulk sample (XMag, %).

The iron redox state of the bulk sample (Fe3+/Fetot) and estimated H2 (mmol/kg) potential are also presented.本数据集同时给出了块体样品的铁氧化还原状态（三价铁与总铁之比，Fe³+/Fetot）以及以毫摩尔/千克为单位的估算氢气电位。