rutile

/roo-teel, -tahyl/US // ˈru til, -taɪl //UK // (ˈruːtaɪl) //

金红石,红石,金红宝石,金石

Definitions

n.名词 noun

1
- : 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.

Biotite, if present, is brown; epidote is yellow or colourless; rutile, apatite and quartz all occur with some frequency.
Its most common ore is rutile (TiO2), which resembles silica in many respects.
Rutile is much lighter, 4·2, and the streak light-brown; tourmaline is only 3·2.
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.