Silica 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. Micaceous iron oxides are very well known and often used pigments in the protective and marine coatings industry for many years.