Leucite, Nepheline, and Nepheline Syenite

Nepheline syenite is a feldspar-substitute mineral widely used as a flux in glass and ceramic manufacturing, valued for its low melting point and alumina content; leucite and nepheline in other forms serve overlapping but distinct industrial roles. The US tariff schedule subdivides this heading into nepheline syenite (2529300010) and leucite or nepheline excluding nepheline syenite (2529300050), a distinction that matters for ceramic and glass producers sourcing specific mineralogical grades. Canada and Norway are the two leading suppliers to the US market, with Canadian deposits being among the largest commercially exploited nepheline syenite reserves globally.