Diorite

Diorite is a block confirmed to be released in the 0.9.0 update of Minecraft Pocket Edition, it forms similar to gravel, so it will appear in large veins underground, and sometimes be above ground too.

Crafting
You need two Cobblestone, and two Quartz to craft Diorite. You need four Diorite to craft Polished Diorite. Most likely these items will be crafted in the stonecutter.