Cracked Stone Brick

Cracked Stone Brick is a new block type that was implemented in the 1.8 Beta update. It can be found in Strongholds, which were also implemented in the 1.8 update. It can also be crafted (in an unconventional manner) by creating stone brick stairs, and subsequently mining them. There is also a random chance for these to be dropped instead of stone bricks or mossy bricks when mining a stone brick.

Trivia

 * It appears that, as of 1.8 pre-release, these blocks act like mushroom cap blocks, generating a differing texture once via location.