Mossy Stone Brick

Mossy Stone Brick is a new block type that was implemented in the 1.8 Beta update. Mossy Stone Brick is one of the main components that make up Strongholds, which were also added in the 1.8 update.

Trivia
They randomly spawn in strongholds, and there is no current crafting recipe. May be crafted later with four mossy cobblestone (?)