The Versatile Mineral Ilmenite and its Wide Applications Introduction Ilmenite is a naturally occurring iron-titanium oxide mineral which is black in color. Chemically, it is an iron(II) titanium oxide with the chemical formula FeTiO3. It crystallizes in the trigonal-hexagonal system and its crystal structure is rutile-type. This makes up about 1% of the Earth's crust and is one of the...