Shumway, A. O. et al., (2025) Mineralogically Diverse and Salt-rich Regolith in Jezero Crater Characterized using X-ray Spectroscopy Supporting Information Bundle. PDS Geosciences Node. doi:10.17189/esjs-6z59 This bundle contains supporting information for the manuscript: "Mineralogically Diverse and Salt-rich Regolith in Jezero Crater Characterized using X-ray Spectroscopy" (2025). A. O. Shumway (1), T. V. Kizovski (2,3), D. C. Catling (1), S. J. VanBommel (4), M. W. M. Jones (5), B. J. Orenstein (6,7), M. E. Schmidt (2), M. M. Tice (8), J. A. Hurowitz (9), A. L. Knight (4), B. C. Clark (10), L. Wade (11), E. L. Cardarelli (12), A. Y. Li (1), M. J. Zawaski (8,13), D. A. Klevang (14), W. T. Elam (1,15), E. M. Hausrath (16), A. H. Treiman (17), J. Henneke (13), N. J. Tosca (18), Y. Liu (11), M. L. Cable (11), A. C. Allwood (11), and the PIXL team. Journal of Geophysical Research: Planets, 130, e2024JE008912. doi:10.1029/2024JE008912. 1 Department of Earth & Space Sciences, University of Washington, Seattle, WA 98105, USA 2 Department of Earth Sciences, Brock University, St. Catharines, ON L2S 3A1, Canada 3 Department of Earth and Space, Royal Ontario Museum, Toronto, ON M5S 2C6, Canada 4 McDonnell Center for the Space Sciences, Department of Earth, Environmental, and Planetary Sciences, Washington University in St. Louis, St. Louis, MO 63130, USA 5 School of Chemistry and Physics and Central Analytical Research Facility, Queensland University of Technology, Brisbane, QLD 4000, Australia 6 School of Earth and Atmospheric Sciences, Queensland University of Technology, Brisbane, QLD 4000, Australia 7 Centre for Planetary Surface Exploration, Queensland University of Technology, 2 George St, Brisbane, QLD 4000, Australia 8 Department of Geology & Geophysics, Texas A&M University, College Station, TX 77843, USA 9 Department of Geosciences, Stony Brook University, Stony Brook, NY 11794-2100, USA 10 Space Science Institute, Boulder, CO 80301, USA 11 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA 12 Department of Earth, Planetary, and Space Sciences, University of California Los Angeles, Los Angeles, CA, USA 13 Geosciences Department, Fort Lewis College, Durango, CO 81301, USA 14 Technical University of Denmark, DTU Space, Department of Measurement and Instrumentation, Kongens Lyngby, 2800, Denmark 15 Applied Physics Lab, University of Washington, Seattle, WA 98052, USA 16 Department of Geoscience, University of Nevada, Las Vegas, Las Vegas, NV 89154, USA 17 Lunar and Planetary Institute, Universities Space Research Association, Houston, TX 77058, USA. 18 Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK The Planetary Instrument for X-ray Lithochemistry (PIXL) onboard the Perseverance rover has characterized the composition of Martian regolith at a scale of hundreds of microns using micro-focus X-ray fluorescence spectroscopy. PIXL data reveal a diverse population of regolith grains with distinct spectral, chemical, and crystallographic properties, through which we identified the mineralogy of individual regolith components. Olivine, phyllosilicate, carbonate-bearing phases, Cr-Ti-spinel, plagioclase, and Fe-sulfate are all inferred from the data, and potential local and regional bedrock sources are proposed for each. PIXL also inspected dust and soil components, which are found to be geochemically similar to analogous components characterized elsewhere by preceding missions. Unlike other sites, regolith on the western fan front of Jezero crater contains fewer sulfates, but is highly enriched in Cl (up to 2.0 +/- 0.5 wt. %), which likely includes chlorides, chlorates, and/or perchlorates. PIXL also finds evidence of hydration in the regolith, potentially carried by salts, as interstitial water, and/or in adsorbed phases. PIXL's observations of diverse amorphous and crystalline components, multiple styles of aqueous alteration, and enrichments of brine-forming salts provide exciting new justification for the return of a Martian regolith sample to Earth for further study. This bundle contains the following collections: data - CSV containing oxide wt.% values (PIXLISE v3.2 expressions) for each PMC (PIXL Motion Counter) across 5 regolith scans and a CSV containing bulk sum oxides for regions of interest across the scans. document - shumway_et_al_2025_supplement.pdf (Supporting Information document) Each document and data product in this bundle is described by a PDS4 label in a separate file with the same name but with the extension XML. PDS4 labels are XML (eXtended Markup Language) files that conform to the PDS4 Information Model XML schema at https://pds.nasa.gov/pds4/schema/released/. They are best viewed in an XML-aware text editor, and may be used by software that can manipulate XML documents. See these sources for more information. - For information about PDS4, see https://pds.nasa.gov/pds4/about/. This bundle was created by Andrew Shumway and Abigail Knight, and is archived at the Geosciences Node of the Planetary Data System. Questions about this bundle may be directed to geosci@wunder.wustl.edu.