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What clay looks like: Estonian clay from the Quaternary epoch.

Clay is a fine-grained silicate mineral made when rocks break down. When wet, clay has a plastic quality, and can be used to make pottery and bricks and other things. Pottery is when clay used to model shapes and then fired in a kiln.

Clay often contains some water because the water molecules stick to the tiny grains. There may also be some organic materials in the clay.