- a common mineral, titanium dioxide, TiO2, usually reddish-brown in color with a brilliant metallic or adamantine luster, occurring in crystals: used to coat welding rods.
Origin of rutile
1795–1805; < French < German Rutil < Latin rutilus red1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for rutile
Rutile is much lighter, 4·2, and the streak light-brown; tourmaline is only 3·2.Getting Gold
J. C. F. Johnson
The principal titanium minerals are rutile (titanium oxide) and ilmenite (iron titanate).
Rutile and ilmenite both have high specific gravity and are little affected by weathering.
There is no distinct cleavage (rutile and anatase have cleavages); hardness 5-6; sp.
Minute crystals of brookite have been detected with anatase and rutile in the iron-ore of Cleveland in Yorkshire.
- 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: TiO 2 . Crystal structure: tetragonal
C19: via French from German Rutil, from Latin rutilus red, glowing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- 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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