Terracotta is 100% natural. Typically, a reddish, unglazed ceramic material. In Italian, “terracotta” means “baked earth”. 

It is rather strong and durable, resistant to heat and climate. Because terracotta contains a significant amount of iron, it will melt at a lower temperature than other types of clay such as stoneware or porcelain. Thus, it can be considered a sustainable option. To make objects from terracotta waterproof and non-porous, glazing might be needed.