Feldspar is an alkali metal or alkaline earth metal aluminosilicate mineral such as potassium, sodium, calcium or strontium. The crystal structure is a framework structure. Its main components are SiO 2, Al 2 O 3, K 2 O, Na 2 O, CaO and the like. The feldspar minerals are widely distributed in the earth's crust, accounting for about 50% of the total …