Fig. 3
Metal weight fraction (fmetal) versus planetary Fe/Mg mass ratio for various rocky bodies and chondritic meteorite classes (EC, enstatite; CC, carbonaceous). Bulk Mercury estimates from Nittler et al. (2018), Chabot et al. (2014), and Zolotov et al. (2013). Mercury is a singular outlier from the cluster defined by the other objects. Dashed line is trend from silicate added to Mercury with the composition of its bulk silicate (Table 3); points on line show total body mass in units of M☿. An original mass 2–4 ×M☿ would put it within the rocky body cluster. Data are from Fegley (2014), Dumoulin et al. (2017), McDonough and Sun (1995), Rivoldini et al. (2011), Javoy et al. (2010), and Table 3