Upper figure: Modern magnetotactic bacteria, one showing a chain of magnetite crystals, as seen in the backscattered scanning electron microscope.
Lower figure: Magnetite crystals and chains of magnetite crystals in the Martian meteorite ALH84001 in the backscattered scanning electron microscope. One conspicuous chain indicated by arrows. The diameter of a single crystal ia approximately one-millionth of an inch.
° 26 February 2001: New Evidence Strengthens Claims of Ancient Life on Mars - Study of Martian Meteorite Reveals Magentic Fossils, NASA JSC
° 26 February 2001: NASA JSC Background Information on PNAS ALH84001 Magenetite Paper, NASA JSC
° 26 February 2001: Case For Life on Mars Withstands Criticism, Gains Scientific Support, NASA JSC
° 26 February 2001: Scientists Finds Evidence of Ancient Microbial Life on Mars, NASA ARC