Rocks 3 - Extended License by dexsoft-games
Huge collection with 25 excellent rock models with 2K texture and very low poly count. Each rock model is from 500-1400 polygons.
Materials are made from albedo, normal, occlusion, metallic and roughness maps.
In unity pack we included sample terrain with 4 terrain textures and 3 grass textures, so you are ready to go for large worlds.