Geologists say Martian meteorite ALH84001 is 95% orthopyroxene.
However, I suspect many neuron remains have been misidentified as
orthopyroxene minerals. The following micrographs show neuron remains
in Martian meteorites ALH84001 and EET79001.
http://www.wretch.cc/album/show.php?...782977326&p=88
http://www.wretch.cc/album/show.php?...782977327&p=89
http://www.wretch.cc/album/show.php?...782968643&p=90
Photo credit for above three micrographs: Dr. Allan Treiman
http://www.wretch.cc/album/show.php?...782961137&p=91
Photo credit for above SEM image: Dr. David S. McKay
http://www.wretch.cc/album/show.php?...782961138&p=92
http://www.wretch.cc/album/show.php?...782961142&p=93
Photo credit for above two micrographs: Prof. Jeffrey G. Ryan
Earthly brain cells for comparison: http://en.wikipedia.org/wiki/Neuron
Image Sources:
http://www.lpi.usra.edu/publications.../slide_22.html
(first and second photos above)
http://www.lpi.usra.edu/lpi/meteorit...icalities.html (third
photo)
http://www.lpi.usra.edu/meetings/LPSC99/pdf/1951.pdf (fourth photo)
http://www.cas.usf.edu/~jryan/EET79001.html (fifth & sixth photos)

Read more at http://www.wretch.cc/blog/lin440315&category_id=0