This pack contains 5 realistic procedural materials for Blender.

They all use object as texture coordinate so UV's are not required (you can change this easily in the shader tab).
Render Engine : Cycles
Use displacement : Yes (Better results with adaptive subdivision)

Here is what a simple plan can become with just a few clicks :

Turn a basic roundish object into a realistic volcanic rock :

Each material has it's own customized node group, so you will be able to customize it with different values like scale, colors, wetness, displacement, AO (ambiant occlusion) :

Here are a few exemples of what you'll can adjust :

How to import the materials :

• Go to File → Append

• Look for the file that contains the materials and double click on it

• Go to the material folder

• Select the material and click on "Append"

• Now you can assign the material to your object and customize it in the "material properties" panel or in the Shading workspace.