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Fig. 5. (A) Scanning electron microscopy image and (B) energy dispersive x-ray analysis of a magnetic particle separated from the soil core, which was typical of others studied. Energy dispersive x-ray data showed this particle by an iron oxide, not greigite. This particle is too large to be fly ash or to be the product of iron biomineralization by magnetotactic or dissimalatory bacteria. The shape is inconsistent with magnetotactic crystals, which are usually cubic or octahedral, and more rarely prismatic, tooth, arrowhead, and bullet-shaped. Vertical axis is in CPS.
