... 2, high silica 3, abrasion resistant 4, best price 5, fast and safe delivery 1. ProductName: Flint pebblesSize: 2-4cm, 4-6cm, 6 ... -8cm, 8-10cm, 10-12cm, 12-15cmChemical and physical properties: SiO2>=99.31%Al2O3<=0.36%Fe2O3<=0 ... <=1.35Appearance of pebbleround(ellipse)Color of product after burninggray and whiteUsage: suitable for all kinds of ceramic raw material & mineral ...