Possible to create a artifical granite biome?

[Percocet 3,000]

IS it possible? Id really like to know. Im doing this thing where I make all the biomes I can near my house, this and a few others I know I cant make are missing.

[pdavis]

I was curious about this too, so I opened up builder's workshop and grabbed 2 full stacks of granite blocks, granite walls, marble blocks, and marble walls.
I dug out a small cave in cavern level, and braced myself for the slightly tedious task of building an artiffical biome.
About ten seconds later, I was attacked by a granite elemental.
Yeah, you can build an artificial granite biome, alright. It only requires about twenty to fifty blocks, even.
I repeated the process with marble, and BAM, medusa attack.

I haven't tested to see if this works on Underground level or on the Surface. To be honest, I really wasn't expecting this to work at all. In all three tests, I placed both blocks and background walls. The third time, I didn't hear the tell-tale KRRKRKCRAH! of the medusa until I placed some marble walls to go with the floors, so that might be a requirement.