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mineral, one of three forms of titanium dioxide (TiO2; see titaniumtitanium
[from Titan], metallic chemical element; symbol Ti; at. no. 22; at. wt. 47.867; m.p. 1,675°C;; b.p. 3,260°C;; sp. gr. 4.54 at 20°C;; valence +2, +3, or +4.
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). It occurs in crystals, often in twins or rosettes, and is typically brownish red, although there are black varieties. Rutile is found in igneous and metamorphic rocks, chiefly in Switzerland, Norway, Brazil, and parts of the United States.



a mineral, one of the three polymorphs of titanium dioxide (titania), TiO2. It contains iron, chromium, and sometimes vanadium, niobium, and tantalum as admixtures. The structure of rutile differs from that of the other two polymorphs of TiO2—ana tase and brookite—in the nature of the coupling of the octahedral [TiO6] groups, which are connected to each other by two common edges, forming chains parallel to the c-axis. The c-axis lies in a plane corresponding to layers of close hexagonal packing. Rutile crystallizes in the tetragonal system. It is a semiconductor and is antiferromagnetic. It has a hardness of 6–6.5 on Mohs’ scale, and its density ranges from 4,200 to 5,600 kg/m3, depending on the content of niobium and tantalum. Pure rutile is colorless, but the mineral is almost always found in various tints as a result of various admixtures.

Rutile is a common accessory mineral in rocks. In pegmatites and hydrothermal veins it occurs as large prismatic or acicular crystals. Rutile-bearing quartzites and chloritic, graphitic, and other schists have industrial value as titanium ores. Rutile is also accumulated in placers, which are especially valuable ores. Synthetic rutile is used in the jewelry industry.


Mineraly: Spravochnik, vol. 2. Moscow, 1965.


TiO2 A reddish-brown tetragonal mineral common in acid igneous rocks, in metamorphic rocks, and as residual grain in beach sand.


A common mineral, red-to-brown or black in color; contains 60% titanium; used in paints, as a coating on welding rods to stabilize the arc, and as an opacifier in ceramic glaze and in glass.
References in periodicals archive ?
The transaction valued Sierra Rutile at GBP215 million.
From the feedstocks ilmenite, rutile, and titanium slag up to the sales markets, information on the regions Western Europe, Eastern Europe, North America, South America, Asia-Pacific, the Middle East, and Africa is given.
Iluka produced 388,600 mt of zircon, 136,500 mt of rutile, and 164,900 mt of synthetic rutile in 2015.
2] in the rutile form, along with some common extender pigments, were procured from commercially available sources.
Rutile and anatase are the two most important crystalline structures of Ti[O.
The] announcement by Sierra Rutile of a major investment in its mining operations, marks a turning point as we start to rebuild our economy following recent Ebola-related challenges," Sierra Leone's president, Ernest Bai Koroma, said in a statement following Sierra Rutile's announcement.
Both anatase and rutile have tetragonal crystal structures.
The addition of antibiotics to the control plasma casued a decrease in all the parameters while addition of rutile increased their levels.
Until the mid-1990s, a third of the world's rutile came from this West African country.
2011) and Pb-diffusion data (Cherniak 2000) suggest that the rutile ages from NW Bhutan may be explained by rapid cooling ( greater than 50 degC/Ma) from peak P-T conditions of ca.
According to the contract, the pigment producer will purchase 25,000 tonnes per annum of White Mountain's standard grade, natural rutile concentrate, at USD1200 per ton FOB port.