Aidy Burrows 3D - Regarding creating little chipped stones in blender it was pretty simple in 2.80 just the voronoi texture node set to crackle and then BOOM! BUT! The new 2.81
Voronoi — Blender Manual
Blender Tutorial HOW TO MAKE THIS TEXTURE WITH VORONOI TEXTURE - YouTube
modifiers - Find a way to voronoi structure - Blender Stack Exchange