... manufacturer 3.Short delivery time 4.high quailty,competitive price of feldspar 1.Introduction:Feldspar, the potassium, sodium, calcium ... SiO2, Al2O3, K2O, Na2O and CaO, etc.. Feldspar group minerals in the earth's crust, the most widely distributed ... , but only in a considerable enrichment of feldspar possible as industrial minerals. Feldspar group of four categories: Potash feldspar, albite, anorthite ...