Planet bulk density vs. all rocky elements considered in our analysis in [X/Fe] form. As in Figure 3, rocky solar system bodies (Moon, Mercury, Venus, Earth, and Mars) are plotted for comparison as orange diamonds. Rocky planets hosted by FGK and M dwarfs are denoted as circles and triangles, respectively, and are colored by planet radii values. The best-fit linear trends from our MCMC fitting routine are plotted as blue lines along with their 1σ confidence intervals. We provide the Pearson correlation statistics in the bottom left corners of each panel, considering just the FGK-hosted rocky planets and the entire FGKM sample. TOI-1347 b is not present in the Si, O, and Ni panels because it has unreliable host star abundances for these elements.