Cobblestone

Cobblestone is a block in Minecraft Pocket Edition that is obtained by either mining Stone or itself. It can be mined with a Wooden Pickaxe or better.

Uses
Cobblestone is one of the most useful blocks in the game, as it can be used as an easily available building material. It can also be used to craft Stone-level tools.

Crafting

 * 3 Cobblestone + 2 Sticks => Stone Pickaxe/Axe
 * 2 Cobblestone + 2 Sticks => Stone Hoe
 * 1 Cobblestone + 2 Sticks => Stone Shovel
 * 2 Cobblestone + 1 Stick => Stone Sword
 * 8 Cobblestone => 1 Furnace
 * 1 Cobblestone + 1 Vine => 1 Mossy Cobblestone
 * 2 Cobblestone + 2 Nether Quartz => 2 Diorite
 * 1 Cobblestone + 1 Diorite => 2 Andesites
 * 3 Cobblestone + 1 Blaze Rod => 1 Brewing Stand
 * 6 Cobblestone => 3 Cobblestone Walls
 * 3 Cobblestone => 6 Cobblestone Slabs
 * 4 Cobblestone + 3 Wooden Planks + 1 Iron Ingot + 1 Redstone => 1 Piston
 * 8 Cobblestone + 1 Bow + 1 Redstone Dust => Dispenser
 * 8 Cobblestone + 1 Redstone Dust => Dropper
 * 6 Cobblestone + 2 Redstone Dust + 1 Nether Quartz => 1 Observer

Smelting
1 Cobblestone + Any fuel => 1 Stone (In Furnace)

Trivia

 * Stone or Cobblestone can be mined by hand, but it will not yield the resource after being broken.
 * It takes about 4 seconds to do so.
 * Flint and Steel or Shears can be used to break Stone faster than by hand.
 * The Player can make a Cobblestone Generator with Water and Lava, making it become an infinite resource in the Overworld.
 * This is not possible in The Nether, however, as Water cannot be placed there, and will evaporate instantly.
 * When using invert colors, the texture for Cobblestone is reversed so it looks like End Stone. This case is the same with End Stone; inverting its color makes it look like Cobblestone.
 * Ghasts can't blow up Cobblestone, making it good protection in the Nether.
 * Stone actually mines faster than Cobblestone.
 * Cobblestone is one of the oldest blocks in Minecraft.
 * It naturally spawns in Dungeons.
 * Before Update 0.12.1, Cobblestone was used to make a player-built structure known as the Nether Reactor.
 * Cobblestone was the very first block ever made.