ru·tile /ˈruˌtil/
金紅石
Ru·tile n. 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.
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rutile
n : a mineral consisting of titanium dioxide in crystalline
form; occurs in metamorphic and plutonic rocks and is a
major source of titanium