1) Na-Feldspar Specs. : Na2O : 10.0% min K2O : 3.0% max Al2O3 : 18.0% min Fe2O3: 0.05% max SiO2 : 64.0-67.0% 2) K-Feldspar Specs. : K2O : 11.5-13.0% Na2O : 3.0% max Al2O3 : 18.0% min Fe2O3: 0.15% max SiO2 : 64.0-67.0% Size & Packing: At Buyer's Options Quantity : 1500-2000MTS/Month Origin : Liaoning Province China