The thing is Randall already kind of did something like this in his "What-if?" which talked about a diamond meteor hitting the earth...
And basically it boils down to: Either Galileo/Newton/whoever was the smart fuck that discovered it was right and the meteor would only create a crater roughly as deep as it was itself. (This if it could touch the core it would be at least the same size as the earth and the picture would look different)
Or it would be going fast enough to ignore most of all that classical physics stuff, phase through most solid material and blow apart every piece of the earth because it would have enough energy to completely overcome the gravitational force holding everything to everything else here on earth.
(Now granted, those were the two extremes and there might just be a perfect balance in between, but I'm sure as hell not going to look for it! At the very least because getting funding for the experiments is seriously difficult for some reason...)
Und das Maiskorn! Oder war es Weizenkorn? Hmm...