u/3rd2LastStarfighter

I’m a hobby blacksmith and this question is not important, just for funsies, but I’d rather get a, “no way to really tell,” than a confident guess.

I know it’s mostly iron (right?) which creates the magnetosphere that allows us all to exist without being obliterated by radiation. To what degree of accuracy can we estimate the other components? Naturally occurring iron in the crust is basically never pure so I’m assuming a giant mass of it would also contain impurities, but if I’m wrong because of the crazy forces at work down there, I wouldn’t be surprised.