Synthetic gem

• Dark-red mineral
• Red crystal mineral
• Occurs in metamorphic and plutonic rocks and is a major source of titanium
• A mineral consisting of titanium dioxide in crystalline form

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 ...

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) The most frequent of the three polymorphs of titanium dioxide, crystalizing in the tetragonal system, titaniumoxygen 2 .

WordNet Word definitions in WordNet
n. a mineral consisting of titanium dioxide in crystalline form; occurs in metamorphic and plutonic rocks and is a major source of titanium

Wikipedia Word definitions in Wikipedia
Rutile is a mineral composed primarily of titanium dioxide , Ti O . Rutile is the most common natural form of TiO. Three rarer polymorphs of TiO are known: Anatase (sometimes known by the name "octahedrite"), a tetragonal mineral of pseudo-octahedral habit ...