Martian fossils chemically differ from Earthly fossils

I know almost nothing about chemistry, but I do know that Martian
fossils, as manifested in meteorites, are chemically different from
Earthly fossils.

The difference is seen in the difference between meteorites and
Earthly fossils. For example:
1. Many Martian fossils are magnetic, as meteorites are magnetic.
Earthly fossils are not magnetic.
2. Some Martian fossils (namely, meteorites) contain elements and
alloy rarely seen on Earth. Iron-nickel alloy is not seen in Earthly
fossils. The following chemical test reports show some elements unseen
in Earthly fossils:

http://www.wretch.cc/album/show.php?i=lin440315&b=25&f=1691351006&p=48

http://www.wretch.cc/album/show.php?i=lin440315&b=25&f=o1691361022.jpg&p=60

The morphological structure of Martian fossils are identical to
Earthly fossils on the cell/tissue levels at the least. The chemistry
of Martian fossils is different from that of Earthly fossils, not only
because they are of different ages (3-billion-year-old Martian fossils
versus 300-million-year-old Earthly fossils of Mr. Ed Conrad), but
also because they were preserved by different methods.Moreover,
fossils presently on Mars surface died in a way different from Earthly
fossils.

So, no wonder NASA could not find past life on Mars by chemical means.