That grid-like crystalline pattern can't be produced in a lab. It's only present in metals that cool by 1 celsius every thousand years.
>Pub date: 1970
Hmm, [13] https://www.sciencedirect.com/science/article/abs/pii/S00092...
The wide range of cooling rates for IVA irons and their inverse correlation with bulk Ni concentration show that they crystallized and cooled not in a mantled core but in a large metallic body of radius 150±50 km with scarcely any silicate insulation. This body may have formed in a grazing protoplanetary impact.
Uhm,
There is a growing consensus that most iron meteorites come from bodies that accreted early – even before the parent bodies of the chondrites – and that 26Al, which has a half-life of 0.7 Myr, is the major heat source that melted them.
What? If I understand correctly, it was a large 150km metal blob full of radioactive alumin(iu)m that controlled the crystallization process over millions of years. Now that’s hardcore metal.