What is how to make smooth stone?

To make smooth stone, you need to first obtain regular stone. This is most commonly acquired by mining cobblestone and then smelting it in a furnace.

Once you have the stone, simply smelt the stone again in a furnace. This second smelting process will convert the stone into smooth%20stone.

You will need a fuel source like coal or wood to power the furnace for both smelting processes.