Chains of Magnetite Crystals in Allan Hills 84001: Evidence of Biological Origin

Details Chains of Magnetite Crystals in Allan Hills 84001: Evidence of Biological Origin Chains of Magnetite Crystals in Allan Hills 84001: Evidence of Biological Origin

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mmws.work...14f&link_type=abstract

Workshop on the Issue Martian Meteorites: Where do we Stand and Where are we Going?, p. 14

Biology

Bacteria, Carbonates, Globules, Snc Meteorites, Exobiology, Crystals, Anaerobes, Magnetic Moments, Magnetite, Iron

Scientific paper

The presence of magnetite crystals in carbonate globules in ALH-84001 was one fact leading to the suggestion that this meteorite may contain relics of martian life. These magnetite crystals are morphologically similar in shape and size to magnetosomes formed by magnetotactic bacteria, but less so to typical inorganically formed magnetite crystals. The size range is significant, as within this range the magnetic moment of the crystals is maximal. Terrestrial magnetobacteria produce magnetosomes, magnetite (Fe3O4), or greigite (Fe3S4) crystals assembled into chains, and the organisms use these chains for aligning themselves along the prevailing magnetic field. No inorganic process is known to produce similar structures.

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