I will break down my process for the creation of a simple rock material using Substance Designer. For this type of material, I selected the Physically Based (Metallic/Roughness) Graph Template and deleted the Metallic output since it isn’t necessary for this substance.
The first step is to add the nodes useful for the stone material, so from the Substance Designer library we need: the BnW Spots 2 and Grunge Map 001 noises (these are the base elements of the stone material), the Height to Normal World Units filter (or the Normal filter since they are almost the same), three Levels filters, a Blend filter, a Blur filter and the Gradient Map filter that will give colour to the rock.
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