rutile


From The Collaborative International Dictionary of English v.0.48:

Rutile \Ru"tile\ (r[udd]"t[i^]l), n. [L. rutilus red, inclining
   to golden yellow.] (Min.)
   A mineral usually of a reddish brown color, and brilliant
   metallic adamantine luster, occurring in tetragonal crystals.
   In composition it is titanium dioxide, like octahedrite and
   brookite.
   [1913 Webster]
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