I haven't seen a Cnat that looks like that yet. Very nice looking stone. Mine took ages to lap also. It broke in a DMT plate nicely. I think if you can feel the difference within the stones that might mean that the color sections my be rougher. Hopefully someone with more experience with a wider variety of these stones with see this. Some people on here had to go through a few of these before they found one that works. I would say try it out and see how it works. Again very interesting looking stone. Oh no I hope I don't turn into a rock hound cause that will cost me.