rutile
Titanium oxide mineral, TiO2, a naturally occurring ore of titanium. It is usually reddish brown to black, with a very bright (adamantine) surface lustre. It crystallizes in the tetragonal system. Rutile is common in a wide range of igneous and metamorphic rocks and also occurs concentrated in sands; the coastal sands of eastern and western Australia are a major source. It is also used as a pigment that gives a brilliant white to paint, paper, and plastics.
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