I can’t seem to find it anymore, was it removed?
I don’t know what do you mean by ‘Dirt’ material, is it even existed in before?
Nevermind, I haven’t built in a LONG time so I remembered the ‘Pebble’ material as the dirt material.
Could’ve also mistaken the Terrain materials (Ground or Mud) as a Part material, for the record.
If you’re looking for some neat dirt textures however, try using brown slate for solid dirt, and brown grass for more powdery looking dirt