Accessory phases include titanite, apatite, corundum, zircon, magnetite and ilmenite. Zircon, apatite, titanite, magnetite, ilmenite, and sulfides occur as accessory minerals. Magnetite, zircon, apatite, ilmenite, biotite, and garnet are common accessory minerals. Using magnetic separation, the titanium ores ilmenite and rutile are removed. The accessory minerals are magnetite, ilmenite, apatite, and titanite. The basalt dunes are believed to contain the minerals chromite, magnetite, and ilmenite. Oxide minerals such as magnetite, ilmenite, or ulvospinel. Common titanium-containing minerals are anatase, brookite, ilmenite, perovskite, rutile, and titanite (sphene). It is the second largest producer of ilmenite, palladium, rutile and zirconium. Oxides, such as magnetite or ilmenite, are also common. Generally, it is sourced from ilmenite, rutile, and anatase. Instead of directly using ilmenite, "rutile slag" is used. Titanomagnetite may undergo oxyexsolution during cooling, resulting in ingrowths of magnetite and ilmenite. Most ilmenite is mined for titanium dioxide production. It is mainly sourced from ilmenite ore.