Sodium feldspar chemical formula or albite formula- NaAlSi 3 O 8Ĭalcium feldspar chemical formula- CaAl 2 Si 2 O 8. Potassium feldspar chemical formula or (K-spar) formula- KAlSi 3 O 8 Included in this group are orthoclase, microcline, and plagioclase feldspars. This is a common mineral group and makes up about 60% of the exposed rocks, as well as sand, clay, and other unconsolidated sediments, and are important parts of rock classification schemes. Aluminum silicates of soda, potassium, or lime belong to this group of natural minerals. Feldspar can be described as a large group of rock-forming silicate minerals. Feldspar refers to a group of minerals that contain alumina and silica (SiO₂) in their chemical makeup, and are natural minerals.
