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Earthenware A nonvitreous pottery that is glazed or unglazed and is fired below 1,200°C (2,190°F) is known as earthenware. Water can be absorbed by earthenware, also known as terracotta. Most modern domestic earthenware is coated with ceramic glaze, which makes it impervious to liquids.   Additionally, porcelain, bone china, and stoneware are important types of pottery, all of which are fired at high enough temperatures to vitrify. It includes "most building bricks, nearly a …