I saw a really beautiful marble the other day and so today I decided to try create a material based on it.
It ended up being a relatively simple, but yet really fun material to work with.
100% Substance Designer. Rendered in Marmoset Toolbag.
I tried to make the swirl naturally join with the seam of the sphere to give it a more natural look.
I know it's not realistic with the emissive material, however, it certainly brings out a bit of magic.
With more transparency and an hdri map driving most of the light.