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These SHAB test fired bars are 95% nepheline syenite (5% Veegum added). By cone 02 (bar stamped #4) is self-glazing and glass-like with a total shrinkage (plastic to fired) of 15% (less than some porcelains). At cone 03 (the #5 bar) the porosity is 3% (a stoneware). This is not an absolute indication of the materials' melting profile because of the Veegum, it behaves as a powerful flux and melting catalyst.
The Blue Mountain nepheline syenite deposit in Havelock, Ontario, is a major, high-purity industrial mineral source mined since 1955 for glass, ceramics, and filler applications. This 99% pure, iron-poor deposit consists of albite, microcline, and nepheline. It has less than 0.1% free SiO2 and Fe2O3! The deposit is approximately 400 feet deep.
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Covia Nepheline Syenite
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