My company can supplay a Pottery Stone origin from Indonesia ( lump & powder) . Speck of Pottery Stone : Fe2O3 ( 1.07 % ) , Al2O3 ( 10.50 % ) , CaO ( 0.83 % ) , MgO ( 0.35% ) , MnO2 ( 0.07% ) , Na2O ( 1.34% ) , K2O ( 4.87% ) , SiO2 ( 75.57% ) , TiO2 ( 0.04% ) , LOI ( 5.09% ) .