Dear Sir/Madam, Hope this mail finds you well. This is Burt from Acooker from China. Our company has a large amount of nepheline powder, potassium feldspar for sale, and there are many minerals to ensure long-term stable supply. Nepheline Price Item:K200 EXW:$240/ton Fe2O3: 0.08, SiO2: 61.79, Al2O3: 21.14, K2O: 5.63, Na2O: 8.74, CaO: 0.16, MgO: 0.10, TiO2: 0.03 Item:K100 EXW:$189/ton Fe2O3: 0.12, SiO2: 61.17, Al2O3: 21.02, K2O: 5.63, Na2O: 8.55, CaO: 0.31, MgO: 0.08, TiO2: 0.05 The formula can be adjusted according to customer needs. Need further specification, pls feel free to contact. Best regards, Burt