If we go to the considerable length of sending actual human researchers to Mars, we shouldn't cheap out on equipment: mass-spectroscopes, microscopes, electron

If we go to the considerable length of sending actual human researchers to Mars, we shouldn't cheap out on equipment: mass-spectroscopes, microscopes, electron microscopes, ... you name it. That would give us lots of opportunity to examine samples and compare that to what we know from Earth. That's assuming that we are not contrained by mass or volume on the mission which seems reasonable with a SpaceX Starship-style mission because if we were then we shouldn't be sending humans at all imo.