rutile

rutile

[roo-teel, -tahyl]
noun
a common mineral, titanium dioxide, TiO 2 , usually reddish-brown in color with a brilliant metallic or adamantine luster, occurring in crystals: used to coat welding rods.

Origin:
1795–1805; < French < German Rutil < Latin rutilus red1

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World English Dictionary
rutile (ˈruːtaɪl)
 
n
a black, yellowish, or reddish-brown mineral, found in igneous rocks, metamorphosed limestones, and quartz veins. It is a source of titanium. Composition: titanium dioxide. Formula: TiO2. Crystal structure: tetragonal
 
[C19: via French from German Rutil, from Latin rutilus red, glowing]

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American Heritage
Science Dictionary
rutile   (r'tēl', -tīl')  Pronunciation Key 
A lustrous red, reddish-brown, or black tetragonal mineral that is an ore of titanium. Rutile usually occurs as prismatic crystals in other minerals, especially as dark needlelike crystals in quartz. Chemical formula: TiO2.
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