Red crystal mineral

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

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

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 ...

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 ...