Cobblestone

Cobblestone is a darker block, often looking like a roughly paved area. This block only occurs naturally in dungeons or when water and lava flow into each other. It makes great walls for constructions such as castles, towers and roads. Cobblestone is obtained by mining stone. Cobblestone is slightly harder to mine than normal stone, and there is an alternative version of the block known as Moss Stone, which can only be obtained from dungeons.

Current Uses
Cobblestone is required to craft furnaces, Cobblestone Slabs, stone stairs, stone tools and weapons, levers, and dispensers. Because of the abundance of stone, cobblestone is a commonly-used building material.

Cobblestone can be smelted back into smooth stone in a furnace. It takes roughly 11 minutes to smelt an entire stack of Cobblestone into smooth stone. This is helpful to know when using a lava bucket to smelt, as a lava bucket lasts for roughly 17 minutes of use.

History
Cobblestone was one of the first ever blocks as seen in very early Minecraft footage, when the game was just a clone of Infiniminer. Its textures are from one of Notch's previous games called RubyDung. Cobblestone was removed in 0.0.19a, but returned in 0.0.20a. It was removed due to lack of room in the UI. Because of its dark color it was often used in pixel art to represent darker colors until other, darker blocks like black cloth and obsidian appeared.



Trivia

 * Cobblestone is immune to Ghast fireballs, making it useful for guarding portals.
 * Until the release of Minecraft Beta 1.3 cobblestone was used to create stone slabs.
 * Sometime in the future Moss may grow on existing Cobblestone that is in dark areas, turning into Moss Stone.

Pflasterstein Brukowiec