Cobblestone

Cobblestone is a common block, obtained from mining stone. Its texture resembles block of stone with a largely cracked surface.

Mossy cobblestone is a variant of cobblestone with moss growing in its cracks.

Both blocks are mainly used for crafting or as building blocks.

Natural generation
Both cobblestone and mossy cobblestone occur naturally in dungeons, jungle temples, pillager outposts, and underwater ruins. Only cobblestone generates in strongholds and woodland mansions and mossy cobblestone can be found in the form of scattered boulders in the giant tree taiga biome. Cobblestone generates in all types of villages except desert and mossy cobblestone is found in plains, taiga, snowy taiga, and zombie villages.

Post-generation
See also: Tutorials/Cobblestone farming

When water and flowing lava come into contact, the flowing lava is replaced with cobblestone. However, if the lava flows on top of the water from above, stone will be created instead.

Usage
Cobblestone and mossy cobblestone can be used as basic building blocks, as they are highly blast resistant and fairly common.

Silverfish
Silverfish have the ability to enter and hide in normal cobblestone, creating an infested block.

Trivia

 * If a player were to turn Inverted Colors on, the cobblestone texture will look like end stone, but blue.
 * This is because the textures of end stone and cobblestone are inverted, but don't use the opposing colors matched with the High Contrasting.
 * Looking at the top of the cobblestone texture shows an L. This can be used to find north.
 * Mossy cobblestone does not have an infested variant
 * Cobblestone, along with grass blocks, were the first two blocks to be added into Minecraft.

Issues
Issues relating to "Cobblestone", "Mossy Cobblestone", or "Moss Stone" are maintained on the bug tracker. Report issues there.

Gallery
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