Formula: Na4SiO4N.W.: 122.06Item Specification Testing resultAppearance: colorless or slight blue transparent cones conformsNa2O+SiO2: 99.20% min. 99.6%Al2O3: 0.3% max. 0.02%Fe2O3: 0.04% max. 0.01%M.R.: 3.35-3.45 3.40