Figure 8From: Secondary mineral formation associated with respiration of nontronite, NAu-1 by iron reducing bacteria(a) TEM bright field image of the amorphous Fe precipitate (~50 nm dark grain near the top) associated with chained globules of amorphous Si found in the 7 days anaerobic system with killed DIRB. (b) EDXS spectrum indicates that this assemblage is rich is Fe and Si, along with a small amount of Ca.Back to article page