Chemical composition of these ceramics is based on silica network and potash feldspar
(K2O.Al2O3.6SiO2) or soda feldspar (Na2O.Al2O3.6SiO2) or both. Potassium and sodium
feldspar are naturally occurring minerals composed primarily of Potash and soda. The most
important property of feldspar is its tendency to form crystalline mineral leucite when
melted.