Zeolite

zeolites. crystalline aluminosilicates, composed of silica (sio2) and alumina (al2o3), in various proportions plus metallic oxides. produced by hydrothermal treatment of a solid aluminosilicate or of a gel obtained by the reaction of sodium hydroxide, alumina hydrate and sodium silicate. the initially obtained product, or a naturally occurring analog, may be partially ion-exchanged to introduce other cations. specific zeolites are identified by notations indicating crystal structure and predominant cation, e.g., ka, cax, nay