Fig. 4

SWIR reflectance data collected by the Zhurong rover showing rocks containing hydrated silica along the rover traverse. (a) The rover traverses through Sol 276 marked on a satellite image with the inset images showing the NaTeCam images of rocks investigated by the MarSCoDe; (b) the SWIR reflectance curves of the targets measured by the MarSCoDe; (c) Laboratory spectra of hydrated silica (opal, chalcedony) obtained from the USGS spectral library73 for reference.