Cobblestone is mined from Stone. It is also able to be found in dungeons in the Overworld. Cobblestone is able to be created from Water and Lava hit together. A Pickaxe is required to break cobblestone.
How to use cobblestone in Minecraft
The most common use for Cobblestone is to use it as a building block for structures. As getting stone is both fast and the easiest to stack in large quantity, this block will allow you to build structures faster.
You can also smelt Cobblestone in a furnace. Each block will turn back into Stone once completed.
Other items you can craft: