This is a scanning electron micrograph of a microbial iron mat showing all the threads of ferrihydrite mineral left behind by the iron-oxidizing bacteria. Note that there are no bacterial cells present in this image, just the mineral remains. Image produced by Sean McAllister and Clara Chan, University of Delaware.

This is a scanning electron micrograph of a microbial iron mat showing all the threads of ferrihydrite mineral left behind by the iron-oxidizing bacteria. Note that there are no bacterial cells present in this image, just the mineral remains. Image produced by Sean McAllister and Clara Chan, University of Delaware.

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