Our Potassium feldspar is a high-quality mineral renowned for its potassium oxide (K2O) content of 12.5%. Available in lumps, chips, and powder forms Specifications: SiO2 (Silicon Dioxide): 65.51% TiO2 (Titanium Dioxide): 0.03% Al2O3 (Aluminum Oxide): 18.03% Fe2O3 (Iron Oxide): 0.04% CaO (Calcium Oxide): 0.23% MgO (Magnesium Oxide): 0.07% K2O (Potassium Oxide): 12.65% Na2O (Sodium Oxide): 3.35% LOI (Loss on Ignition): 0.30% Available Forms: Lumps, Chips, and Powder