Feldspar and Mica
Feldspar is the name given to a group of minerals distinguished by the presence of alumina and silica (SiO 2). This group includes aluminum silies of soda, potassium, or lime. Felsspar is the single most abundant mineral group on Earth. They account for an estimated 60% of exposed rocks, as well as soils, clays, and other unconsolidated sediments, and are principal .