Substance Designer

I've recently taken on creating my own substances! The goal right now is to make a set of sci-fi themed materials for my Ark mod map. The challenge with three of these rocks will be to achieve the look of stone - but they are not stone, these surfaces grow over time and heal, so I referenced wood, horns, shells and volcanic rocks to help me. I'll be tackling some regular stuff too, like soils, mosses, bark and gravel. These previews won't be full-fledged renders for now. I still consider the materials to be WIP's.