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Origins of magnetite nanocrystals in Martian meteorite ALH84001, Geochimica et Cosmochimica Acta, Volume 73, Issue 21, 1 November 2009, Pages 6631-6677
"We conclude that the vast majority of the nanocrystal magnetites present in the carbonate disks could not have formed by any of the currently proposed thermal decomposition scenarios. Instead, we find there is considerable evidence in support of an alternative allochthonous origin for the magnetite unrelated to any shock or thermal processing of the carbonates."
So the martian bacteria suffered from kidney stones.