A Crystal themed Biome

Basically i imagine a surface biome, that would have different crystal structures, piercing through the terrain.
It could be a new type of crystal or maybe an expansion on the current amethyst?
The underground of the biome could also have a unique structure, something like abandoned crystal mines/ crystalized dungeons etc. with perhaps unique mob variants?
Its asking for a lot but not only would it be aesthetically pleasing, but also could be a stepping stone for more interesting mechanics and builds.I think it would be cool to have more unique and rare "fantasy" themed overworld biomes, like the Mushroom Islands.