The answer is Silicates. KAlSi3O8, orthoclase feldspar, is an important tectosilicate mineral which forms igneous rock. It is a type of potassium feldspar, also known as K-feldspar. It comes under silicate mineral. Orthoclase is a common raw material for the manufacture of some glasses and some ceramics such as porcelain, and as a constituent of scouring powder.