Clay (Block)

Clay
see http://www.minecraftwiki.net/wiki/Clay_(Block)

Clay is a vanilla block found close to or under water. When one clay block is destroyed it drops four clay balls, and each ball can be made back into one block or put in a furnace to craft one brick. Brick blocks are crafted using four bricks, and so each clay block eventually gives you one brick block. It is most quickly mined with a shovel, but takes about the same time as dirt when using a hand. It's light blue/grey colour is a recolour of Sand