a much abused term that should be used only in reference to earthenware of good quality and better-than-average strength. True ironstone was originally developed in England. Originally it was a form of stoneware said to contain powdered iron slag. Ironstone has a slightly porous body.
The trade name for a high grade type of Earthenware. Ironstone is the name given to a higher-fired, durable formula for white-glazed earthenware that was developed in England. Sometimes the term "ironstone" is used indiscriminately to describe white-glazed earthenware of many qualities -- not always the high standard set by the original English ironstone.
a dense, durable, hard white pottery first produced in England during the 18th century. It contains a high percentage of clay and a low percentage of non-clay materials, and is fired at a high temperature.