👉 Zeilanite is an optical material that is primarily found in the minerals zircon and quartz. It is a transparent, translucent crystal with a characteristic yellowish-orange color. Its chemical formula is Zr2SiO4, where R represents rubidium, S represents scandium, and O represents oxygen. Zeilanite is known for its high refractive index, which makes it an excellent material for use in various optical applications such as lenses, filters, and crystal glasses.