[roo-teel, -tahyl] 
| a common mineral, titanium dioxide, TiO2, usually reddish-brown in color with a brilliant metallic or adamantine luster, occurring in crystals: used to coat welding rods. |
| ru·tile (rōō'tēl', -tīl') n. A lustrous red, reddish-brown, or black mineral, TiO2, used as a gemstone, as an ore, and in paints and fillers. [French, from German Rutil, from Latin rutilus, red; see rutilant.] |
rutile (r 'tēl', -tīl') Pronunciation Key
A lustrous red, reddish-brown, or black tetragonal mineral that is an ore of titanium. Rutile usually occurs as prismatic crystals in other minerals, especially as dark needlelike crystals in quartz. Chemical formula: TiO2. |
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