Clay

Clay is also a game feature of Minecraft.
More information can be found on the Minecraft Wiki at Clay..

Clay
Item Details
Type	Block

Clay is a block that can be found abundantly in lush caves, in patches in shallow surface water or converted from mud using pointed dripstone. It can be smelted into terracotta or broken into clay balls which are smeltable into bricks.

For further information, please refer to the Vanilla Minecraft block.