Meteorite

Gibeon meteroite sphere, no, it didn't land like that!
90% Iron
8% Nickel
0.4% Cobalt
0.04% Phosphorous

Around 4 billion years old according to the age of crystallisation of the iron-nickel.

Arrived in Namibia sometime vaguely in prehistory.

The silver grey lines are the Widmanstätten pattern, a crystal formation only created by slow cooling over millions of years.

This one weighs 20g.