Possibly a precious metal or perhaps something we don’t even have on Earth. That sand looks moist.. Clumpy.
Earth has a much more active atmosphere, and tectonic forces at work, so we rarely see a full meteor in situ.
Gold mining on Mars should be fairly basic ~ walk around and pick up flecks. This stuff won't even be eroded down to gold flour ~ but it won't be nuggets either since it won't have passed through a bacterial mat that would expell it in nodules.
That last picture looks like south Georgia soil.