Original: Its bulk density and mass are not known, but assuming that its mean density is like that of Amalthea (around 0.86 g/cm³), its mass can be estimated at roughly 4.3 kg.
Simplified: Its bulk density and mass are not known but assuming that it mean density is like that of Amalthea (~0.86 g/cm³) its mass can be estimated at ~4.3×1017 kg.