This doesn't exist in Minecraft; it's just fiction.
Possible Stones or Possible Rocks are the cracked product of Stone, is one of the most common blocks in Minecraft, being found anywhere in Possible World. Sometimes, Obsidians are found there with them. Possible Stones doesn't have physics applied to it, so it makes a very good construction material in Possible World and can be smelted in Furnace to make Cobblestones.
They can be used for Smelting and Shelter. When Smelting, it becomes Regular Cobblestones and for Decorations.
- Everywhere in/on the Possible World.
- It is currently only found naturally as collections of 30-64 at a time in underground dungeons and in Strongholes in Overworlds.