Figure 9. Scanning electron micrographs of dilamentous 



iron/silica deposits: (A-C) Filament morphology varies from 

 long and short branching filaments to hyphae-like filament 

 networks; (D) Low magnification view of sample from 

 filamentous Fe/Si deposit; (E) Longitudinal section of 

 filament coated in concentric layers of silica; and (F) 

 Short, simply branching filaments with cubic crystal of 

 pyrite. 



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