Don't use chemistry to identify fossil cells:
1First assume everything is a "fossil cell"
2Exclude all evidence that does not support this idea
3Go out and scurry around with meaningless interpretations based upon silly assumptions
4Find what youve expwected would be there all along
5Tell everyone that these are hunks of tissue torn from the host without leaving any hard evidence (The mars soil is awash in blood vessels and red blood cells and thats all)
Im not done even considering more scientific critiques,Im just having fun with how your mind works. Youd make a better engineer than a scientist. You get something in your head and then pursue it to death(or maybe invention as the case may be).
You must learn all the tools we have at hand besides some microscope. We have aerial spectrophotometers on the rovers and we are getting chemistry whether you want it or not. The chemoistry does NOT support your worldview.
ANd your back story about the ancient cib=vilizations etc is absent any proof or evidence so Id not link the two, it makes you look even more foolish.