I will say that assuming that in order for there to be life, the system must be identical or comprable to earth's is silly. We have things living deep within our crust at extreme heats and pressures. We have life brewing away in anaerobic sulfuric conditions of extreme heat. Life exists in some of what we would consider impossibly uninhabitable circumstances. Mars is most likely too cold on the surface to find active life. Hard to imagine kinetics working in that cold of an environment.
If that thing is a rock, then I'd love to know how it was formed. I never learned of any sort of rock formation like that in college. It's...weird but then, all of Mars is pretty strange so far and that's what we should expect. After all, it's a different planet and who knows, could have a different set of rules than earth's.
Try looking for it again. Enlarge it, go to the right end of the white cropping. Scroll down until you can no longer see the white outcrop. It is small, hence why I was jokingly calling it a mutant martian bunny. It's white, two pronged and all by itself. Oh, and another note that it's certainly not a living thing...there are no tracks following it.