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In this study, we report an abiotic process for sulfidogenesis through the reduction of elemental sulfur (S<jats:sup>0<\/jats:sup>) by hydrogen (H<jats:sub>2<\/jats:sub>), mediated by pyrite (FeS<jats:sub>2<\/jats:sub>). The process was investigated in detail at pH 4 and 80 \u00b0C, but experimental conditions ranged between 40 and 80 \u00b0C and pH 4\u20136. The experiments were conducted with H<jats:sub>2<\/jats:sub> as reducing molecule, and \u00b5m-sized spherical (but not framboidal) pyrite particles that formed in situ from the H<jats:sub>2<\/jats:sub>S, S<jats:sup>0<\/jats:sup> and Fe<jats:sup>2+<\/jats:sup> present in the experiments. Fe monosulfides, likely mackinawite, were identified as potential pyrite precursors. The absence of H<jats:sub>2<\/jats:sub> production in controls, combined with geochemical modelling, suggests that pyrite formation occurred through the polysulfide pathway, which is unexpected under acidic conditions. Most spherical aggregates of authigenic pyrite were composed of nanometric, acicular crystals oriented in diverse directions, displaying varying degrees of organization. Although it was initially hypothesized that the catalytic properties were related to the surface structure, commercially sourced, milled pyrite particles (&lt;\u200950 \u03bcm) mediated H<jats:sub>2<\/jats:sub>S production at comparable rates. This suggests that the catalytic properties of pyrite depend on particle size rather than surface structure, requiring pyrite surfaces to act as electron shuttles between S<jats:sup>0<\/jats:sup> and H<jats:sub>2<\/jats:sub>.<\/jats:p>","DOI":"10.1038\/s41598-024-66006-z","type":"journal-article","created":{"date-parts":[[2024,7,31]],"date-time":"2024-07-31T19:21:40Z","timestamp":1722453700000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Micrometric pyrite catalyzes abiotic sulfidogenesis from elemental sulfur and hydrogen"],"prefix":"10.1038","volume":"14","author":[{"given":"Charlotte M.","family":"van der Graaf","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"S\u00e1nchez-Espa\u00f1a","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrey M.","family":"Ilin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"I\u00f1aki","family":"Yusta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alfons J. 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