Ironstone china, ironstone ware or most commonly just ironstone, is a type of vitreous pottery first made in the United Kingdom in the early 19th century. It is often classed as earthenware although in appearance and properties it is similar to fine stoneware. It was developed in the 19th century by potters in Staffordshire, England as a cheaper, mass-produced alternative for porcelain. There is no iron in ironstone; its name is derived from its notable strength and durability. Antique ironstone wares are collectable, and in particular items made by Mason's.