... field. our feldspar can be made to order. Sodium feldspar is the Aluminum silicate minerals of Alkali metal or alkaline earth metals ... such as potassium, sodium, calcium, barium, etc. It is one ... ,Al2O3,K2O, Na2O,CaO. Feldspar can be assorted by its chemical composition:(1). K-feldspar, K2O•Al2O3•6SiO2;(2). Albite, Na2O ...