Mountains are usually composed of sedimentary and metamorphic rocks on the surface, which could be of several variations. This texture specifically tries to replicate the small-scale cliff rock formations in the terrain. Great for steep slopes in particular
The Material has been made to be easily customizable so you can alter its appearance as you prefer. It's free-for-all but tips will be appreciated =]
Hope you have a lot of fun creating!
You'll get 2 .blend files, one that I used to render the thumbnail, and the other with the material applied on a subdivided cube.