Fig. 1
From: Assessing microbially mediated vivianite as a novel phosphorus and iron fertilizer
XRD diffractogram (a) of the three different biovivianite with their respective SEM images (b) and particle size distribution (c). Top- VivInsol7.0—vivianite produced by the microbial reduction of insoluble ferrihydrite, at pH 7.0 and pH 6.5 (middle); bottom- VivSol—vivianite produced by the microbial reduction of soluble Fe(III) citrate. On the XRD diffractogram, GRII is green rust (PDF 13-0092), V is vivianite (PDF 30-0662), and MV is metavivianite (PDF 00-064-0286)