Some jaggy craggy success.  In order to use some of eonite's function formula I had to finally break out V8. It's been sitting on my hard drive since it was released but I haven't used it.

It does have some interesting capabilities beyond previous versions but it certainly crashes a lot.

I like how the constant vector perturbs the main functions of the material....subtle yet definitive. The turbulence nodes were sometimes too swirly for my tastes. I like this better.

The native Vue rocks in V8 take displacement exceptionally well. This is a single rock with criss crossed  crystal basic repeaters..one horizontal, one vertical...perturbed by the veronoi spikes as suggested above. It exhibits some nice angular cleavage with a hint of cracks.

We're getting somewhere. The toughest one to emulate is cubic fracturing and cleavage like you saw in Avatar. Even though the Halelujah mountains were image mapped with photos of China's karst formations, the cubic fracturing was obvious...especially in the little sample of 'unobtainium' that the corporate rat held.

I think some variation of the crystal function will lead to that answer.......