ilmenite

{{Infobox mineral | name = Ilmenite | category = Oxide mineral | boxwidth = | boxbgcolor = | image = Ilmenite-155036.jpg | imagesize = | caption = Ilmenite from Miass, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia. 4.5 x 4.3 x 1.5 cm | formula = Iron(II) titanium oxide, {{Chem2|Fe^{II}TiO3}} | IMAsymbol = Ilm | strunz = 4.CB.05 | dana = 04.03.05.01 | system = Trigonal | class = Rhombohedral () H-M symbol: () | symmetry = R (no. 148) | unit cell = a = 5.08854(7) c = 14.0924(3) [Å]: Z = 6 | color = Iron-black; gray with a brownish tint in reflected light | habit = Granular to massive and lamellar exsolutions in hematite or magnetite | twinning = {0001} simple, {101} lamellar | cleavage = Absent; parting on {0001} and {101} | fracture = Conchoidal to subconchoidal | tenacity = Brittle | mohs = 5–6 | luster = Metallic to submetallic | refractive = | opticalprop = Uniaxial (–) | birefringence = Strong; O: pinkish brown, E: dark brown (bireflectance) | pleochroism = | streak = Black | gravity = 4.70–4.79 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Opaque | other = Weakly magnetic; Liquidus = 1710°C (peritectic) | references = }}

Ilmenite is a titanium-iron(II) oxide mineral with the idealized formula . It is a weakly magnetic black or steel-gray solid. Ilmenite is the most important ore of titanium and the main source of titanium dioxide, which is used as white pigment in paints, printing inks, fabrics, plastics, paper, sunscreen, food and cosmetics.