Nepheline syenite

Mined from our premium deposit in Stjernøy, Norway, Sibelco high-purity nepheline syenite delivers benefits across a range of applications including ceramics, glass, coatings and polymers.

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Nepheline syenite

Nepheline syenite is a quartz-free aluminium silicate. It primarily comprises nepheline, microcline and albite. Because of its extremely low melting point and high alumina content, Sibelco nepheline syenite is used as a flux in ceramics, to lower melting temperatures in glass, and as a functional filler in coatings and polymers.

Learn more about how Sibelco’s nepheline syenite helps glass manufacturers to reduce energy consumption.

Case study: Greener glass

Mined and processed at our premium deposit in Stjernøy, Norway, our nepheline syenite products are characterised by:

high purity

low melting point

high alumina content

free of crystalline silica

high brightness

relatively low refractive index

high inertness 

easy wetting

transparency for UV-radiation 