Fig. S1 CEMOVIS images of BoFeN1 cells at different stages of mineralization.

Fig. S2 Spatial correlation analysis of Fe and organic carbon contents on mineralized BoFeN1 cells.

Fig. S3 STEM images (dark field mode) of mineralized BoFeN1 cells in division, showing the presence of non-mineralized septa (S) and mineralized cell walls (CW).

Fig. S4 Comparison of conventional TEM (a and b) and CEMOVIS (c and d) observations of thin sections of Fe-mineralized BoFeN1 cells.

Fig. S5 Comparison of conventional TEM and CEMOVIS.

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