Red Sandstone

Red Sandstone is a upcoming solid block. It is found naturally at entrances of mesa caves, and can also be crafted from red sand. Unlike regular Sandstone, it does not generate under piles of sand.

Chiseled Red Sandstone is a decorative form of red sandstone with a wither carving on it. As of Snapshot 14w32a, they do not naturally generate, and can only be crafted.

Smooth Sandstone is a decorative form of red sandstone with a smoother texture. Like Chiseled Red Sandstone, it does not currently naturally generate.

World Generation
Red Sandstone generates naturally at cave entrances in mesa biomes. The amount of Red Sandstone that generates is highly variable; some caves may generate a large amount of Red Sandstone, while others may generate just one block.

Trivia

 * The design of the Chiseled Red Sandstone shows a Wither, but the Chiseled Sandstone is a Creeper face.
 * The idea of the Wither appearing on Chiseled Red Sandstone was suggested by Reddit user ULiopleurodon
 * The Wither carved on Chiseled Red Sandstone only has two horizontal pieces on its tail compared to three on its mob counterpart.
 * The Chiseled Red Sandstone also has a "H" and a "C" on it.