Zircon

Zircon is a silicate mineral that is stable at extremely high temperatures and has strong resistance to corrosion.

Due to its stability it is commonly applied in various industrial processes due. Its colour varies from golden yellow, red, brown, blue and green, while colourless stones with gem like qualities are a popular substitute for diamonds.
It is often used in the manufacturing of high performance alloys and specialty steel, electronic and computer components, fibre optics, coating protection for jet turbines, refractory coatings and furnace linings. In powdered form it is a highly reflective bright white and is used as a whitening agent or an opacifier. It is often used as glazing on ceramics and in a variety of dental products including dentures.