Rutile

Origin

From Latin rutilus ("red") because of its common color, named in 1803.

Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: Dana's new mineralogy, John Wiley & Sons, 1997

Noun

1. (mineralogy) The most frequent of the three polymorphs of titanium dioxide, crystalizing in the tetragonal system, TiO