Alkali feldspars are more commonly used commercially than plagioclase feldspars. Albite, or soda spar as it is known commercially, is used in ceramics. The feldsparrich rocks larvikite and a few . get price. feldspar Properties, Uses, Types, Facts Britannica. Feldspar, any of a group of aluminosilie minerals that contain calcium, sodium, or potassium. Feldspars make up .