Fig. 6: Ni is present in bright Mg-sulfate veins, supporting an authigenic origin.
From: Strong nickel enrichment co-located with redox-organic interactions in Neretva Vallis, Mars
PIXL micro-XRF observation from the second “Wallace Butte” scan (a, b), alongside a SHERLOC WATSON color image for context (c). An RGB composite shows the areas with relative enrichment of MgO, SO3, and SiO2 where brownish tones highlight Mg-sulfate (a). Zones of Ni enrichment are seen in yellow (b) and marked with white arrows (a, b, c). Dashed black box shows the approximate area of the PIXL scan (c). Image Credit: NASA/JPL-Caltech.
