ilica is the principle glass-forming oxide making up approximately 60% of soda-lime-silica glass batch. Silica sand/quartz is heat resistant to approx. 1470°C and is used as a foundry sand in the manufacture of molds and cores for casting metals
Feldspar are aluminosilicates with varying amounts of K, Na and Ca in a solid solution series; the main commercial feldspars lie between the sodium(albite) and potash (Microcline) rich end members, and the sodium end of the sodium-calcium series (Oligoclase).
Being a derivative of iron, it is red in color. The protective properties of Micaceous Iron Oxide(MIO) derive from its flake-like particle structure and chemical inertness. It is mainly used in marine paints and can be easily mixed with other colors.