This is a pallasite meteorite a rare slice of an ancient asteroid believed to have formed between its metallic core and rocky mantle over 4.5 billion years ago.
Those glowing crystal sections are olivine, meaning you’re looking at the shattered inner remains of a lost world from the dawn of our solar system.
But it was mostly Hydrogen and Helium for the majority of it. Although I’m defining material as atoms now, so that also a matter of point of view.
It’s still mostly hydrogen and helium
But, like, a little less so.