Orthoclase is a feldspar mineral that is used in the production of glass, ceramic tile, porcelain, dinnerware, bathroom fixtures, and other ceramics. It is also used as an abrasive in scouring powders and polishing compounds. Orthoclase is a common raw material for the manufacture of some glasses and some ceramics such as porcelain. Additionally, it is cut as a gemstone and is an important constituent of igneous rocks brought back from the moon by astronauts.