PBR Rocks is a rocks package that you can use for desktop and also for mobile.
The package contains additional shader options, that allow you to customize the look of the rocks and to create unique rocks.
There are 3 variants of rocks. With moss, sand and snow. Each rock uses the same basic texture for all 3 variants. The difference is that they are blended with different textures and have different properties on materials, depending on the environment.