Feldspar is the mineral name given to a group of minerals distinguished by the presence of aluminum (Al) and the silica (SiO4) in their chemistry. They form in a variety of thermal environments, during the crystallization of liquid rock (magma), by metamorphism of rocks deep in the earth, and in sedimentary processes. Feldspar Specification Feldspar Medium Grade Chemistry Al2O3 (%)20.5 Max Na2O (%)12.0 Max Fe2O3 (%)0.05 Max TiO2 (%)0.1 Max
