Articles | Volume 38, issue 2
https://doi.org/10.5194/ejm-38-135-2026
https://doi.org/10.5194/ejm-38-135-2026
Research article
 | 
23 Mar 2026
Research article |  | 23 Mar 2026

Mackinawite transformation into greigite at room temperature under anoxic and acidic conditions: a corrosion pathway?

Pierre Le Pape, Benoît Baptiste, Guillaume Radtke, Delphine Cabaret, Julie Aufort, Jessica Brest, Camille Baya, Erik Elkaim, Georges Ona-Nguema, Farid Juillot, and Guillaume Morin

Related authors

Atomic-scale environment of niobium in ore minerals as revealed by XANES and EXAFS at the Nb K-edge
Quentin Bollaert, Mathieu Chassé, Guillaume Morin, Benoît Baptiste, Alexandra Courtin, Laurence Galoisy, Gautier Landrot, Cécile Quantin, and Georges Calas
Eur. J. Mineral., 36, 55–72, https://doi.org/10.5194/ejm-36-55-2024,https://doi.org/10.5194/ejm-36-55-2024, 2024
Short summary
Very-low-grade phyllosilicates in the Aravis massif (Haute-Savoie, France) and the di-trioctahedral substitution in chlorite
Benoît Dubacq, Guillaume Bonnet, Manon Warembourg, and Benoît Baptiste
Eur. J. Mineral., 35, 831–844, https://doi.org/10.5194/ejm-35-831-2023,https://doi.org/10.5194/ejm-35-831-2023, 2023
Short summary
Supergene phases from ferruginous duricrusts: non-destructive microsampling and mineralogy prior to (U–Th) ∕ He geochronological analysis
Karina P. P. Marques, Thierry Allard, Cécile Gautheron, Benoît Baptiste, Rosella Pinna-Jamme, Guillaume Morin, Ludovic Delbes, and Pablo Vidal-Torrado
Eur. J. Mineral., 35, 383–395, https://doi.org/10.5194/ejm-35-383-2023,https://doi.org/10.5194/ejm-35-383-2023, 2023
Short summary
Effect of Fe–Fe interactions and X-site vacancy ordering on the OH-stretching spectrum of foitite
Etienne Balan, Guillaume Radtke, Chloé Fourdrin, Lorenzo Paulatto, Heinrich A. Horn, and Yves Fuchs
Eur. J. Mineral., 35, 105–116, https://doi.org/10.5194/ejm-35-105-2023,https://doi.org/10.5194/ejm-35-105-2023, 2023
Short summary
Molecular overtones and two-phonon combination bands in the near-infrared spectra of talc, brucite and lizardite
Etienne Balan, Lorenzo Paulatto, Qianyu Deng, Keevin Béneut, Maxime Guillaumet, and Benoît Baptiste
Eur. J. Mineral., 34, 627–643, https://doi.org/10.5194/ejm-34-627-2022,https://doi.org/10.5194/ejm-34-627-2022, 2022
Short summary

Cited articles

Arrio, M.-A., Rossano, S., Brouder, Ch., Galoisy, L., and Calas, G.: Calculation of multipole transitions at the Fe K pre-edge through p-d hybridization in the Ligand Field Multiplet model, Europhys. Lett., 51, 454, https://doi.org/10.1209/epl/i2000-00515-8, 2000. 
Bai, P., Zheng, S., Chen, C., and Zhao, H.: Investigation of the iron-sulfide phase transformation in nanoscale, Cryst. Growth Des., 14, 4295–4302, https://doi.org/10.1021/cg500333p, 2014. 
Baya, C., Le Pape, P., Baptiste, B., Brest, J., Landrot, G., Elkaim, E., Noël, V., Blanchard, M., Ona-Nguema, G., Juillot, F., and Morin, G.: Influence of trace level As or Ni on pyrite formation kinetics at low temperature, Geochim. Cosmochim. Acta, 300, 333–353, https://doi.org/10.1016/j.gca.2021.01.042, 2021. 
Benning, L. G., Wilkin, R. T., and Barnes, H. L.: Reaction pathways in the Fe-S system below 100 °C, Chem. Geol., 167, 25–51, https://doi.org/10.1016/S0009-2541(99)00198-9, 2000. 
Berar, J. F. and Baldinozzi, G.: XND code: From X-ray laboratory data to incommensurately modulated phases. Rietveld modeling of complex materials, CPD Newsletter, 20, 3–5, 1998. 
Download
Short summary
Iron sulfides are ubiquitous minerals of sedimentary environments. Several research works consider it to be that they preserve evidence of their original deposition environment, allowing us to derive paleo-environmental information. However, linking environmental factors to final mineralogy requires gaining mechanistic-level information about their formation pathways. Here, we propose a mackinawite to greigite "corrosion" pathway, with H+ acting as an oxidant.
Share