Product Description
Nepheline Syenite is an anhydrous sodium potassium alumino silicate. Although feldspar-like in its chemistry, mineralogically it is an igneous rock combination of nepheline, microcline, albite and minor minerals.... Nepheline syenite contributes high alumina without associated free silica in its raw form.... Nepheline syenite fluxes and forms silicates with free silica in bodies without contributing any free silica itself, thereby stabilizing the expansion curve of the fired body.... Because of its sodium content, high nepheline syenite glazes tend to craze (because of the high thermal expansion of Na2O). However bodies fluxed with nepheline syenite do not necessarily exhibit greater expansion than other feldspar bodies. - Digital Fire ceramic materials database
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