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We ar mines owner and manufacturer of Feldspar and Quartz.We are located in Rajasthan,India.Here is the specification of the Feldspar and Quartz.Kindly check them and let us know if they are of your use. 1) Feldspar A) SiO2 : 60-70% Al2O3 : 15-20% Fe2O3 + FeO : below 0.05% TiO2 : below 0.05% K2O : more than 9-10% Na2O : more than 3-4% B) SiO2 : 60-70% Al2O3 : 15-20% Fe2O3 + FeO : 00.16% TiO2 : below 0.05% K2O : more than 7-9% Na2O : more than 3-4% C) SiO2 : 60-70% Al2O3 : 15-20% Fe2O3 + FeO : below 0.05% TiO2 : below 0.05% K2O : more than 5-7% Na2O : more than 2-4% 2) Feldspar Sodium A) SiO2 : 60-70% Al2O3 : 15-20% Fe2O3 + FeO : below 0.05% TiO2 : below 0.05% K2O : more than 2-3% Na2O : more than 8-10 %