>Bismuth, lead, mercury
It appears (I didn't previously know this) that iron, while less than 8 g/cm3 at our "normal" environment conditions, is thought to be closer to 13 g/cm3 (or more) at Earth's core.
So while 9.6 g/cm3 is dense, it's probably not dense enough that it implies a significant percentage of elements heavier than iron.
And I think that it's elements heavier than iron that would be truly shocking because I was taught that stellar fusion stops at iron, apart from supernovas.
"For iron, and for all of the heavier elements, nuclear fusion consumes energy"