procedural - What does this stone texture node group do? - Blender Stack Exchange
Create Stone Wall in Blender - Tip of the Week - Evermotion
SD Guide: a Procedural Stone Wall Texture
Blender Market - Realistic Procedural Granite Stone Shaders for Blender 2.8 EEVEE + Cycles. You get 2 ready-to-use material groups, "All Purpose" Granite (typically gray) and "Meissner Granite" (typically red). https://buff.ly/2JBobD7