This is Bismuth – it is a natural chemical element which chemically resembles arsenic and antimony. Elemental bismuth may occur naturally, but this form does not occur naturally – it was developed in a lab. Still, it’s just mind boggling how beautiful it is!
Andrei's background is in geophysics, and he's been fascinated by it ever since he was a child. Feeling that there is a gap between scientists and the general audience, he started ZME Science -- and the results are what you see today.