What is the chemical composition of ceramics such as in dishes?

Answer 1

The composition varies depending on the dish type and manufacturer, but basically, the chemical composition of ceramic is Al2O3·2SiO2·2H2O, or two molecules of water to each two molecules of silica and each molecule of alumina. Often, dishes are glazed with protective layer and they have various different chemical composition as well. Most common glaze chemical compostion can be found in the link below.