Data to accompany manuscript published in Meteoritics and Planetary Science: "Early Diagenesis at and below Vera Rubin ridge, Gale crater, Mars" by S.M.R. Turner, S.P. Schwenzer, et al., (2021). DOI: 10.1111/maps.13748. CSV file contains data used for starting inputs in thermochemical models executed with CHIM-XPT, as described in the paper.