Our Glassy Quartz lumps is currently the one of only known high purity lump quartz available in large, chemically consistent quantities and is suitable for a wide range of high-tech applications, including the manufacture of High Purity Quartz Sand Manufacturing,Lighting,Optical Fibre,Solar crucibles, quartzware and tubing. Element PPM SiO2 99.89% Al2O3 < 50 PPM Fe < 2 PPM Ca < 6 PPM Mg < 1 PPM B < 2 PPM Na < 12 PPM P < 2 PPM Li < 1 PPM TiO2 < 2 PPM Electrical Conductivity < 5 µS/cm