This is a lovely Isua Skull, with a great carving style. Isua is a 3.7 billion year old mineral, that is quite rare, and only found in Greenland. Having a skull from this strong and powerful mineral is unique.
Just like Tiger Iron, Isua is a form of banded Iron, and therefore shows similar appearances, like dark grey and silver colored stripes. This skull is great when it comes to protection of the aura.