Close-up of the cut surface of a pallasite, or stone-iron, meteorite, showing its structure. Pallasites originate from the boundary between a planet’s core and its mantle. They are composed of iron-nickel (grey) and olivine (yellow). They formed following the break-up of protoplanets in the early solar system, or from later catastrophic planetary impacts.”
This is what Iorek Byrnison makes his armor from.