A blend of clays that are formed into the desired shape and size and then fired in a kiln at very high temperatures. Glazed ceramic tiles, like the ones in this photo, are the most commonly used ceramic tiles for floors and walls. Manufacturers apply a liquid glass to the ceramic tiles and fire them again at high temperatures to fill in the pores of the clay, making the tiles easier to clean and more resistant to fire, water, stains, and fading. Satin or rustic ceramic tile finishes are less slippery and resist scratches better than the glazed tiles. Glazed ceramic tiles typically cost from $1 to $20 per square foot.