Answer: rutile

AnswerCrossword Clue
RUTILETitanium ore
RUTILEReddish-brown mineral.
RUTILEDark-red mineral.
RUTILELustrous, dark-red mineral.
RUTILESemiprecious gem.
RUTILESynthetic gem
RUTILERed crystal mineral
rutilecommon mineral, titanium dioxide, TiO2, usually reddish-brown in color with a brilliant metallic or adamantine luster, occurring in crystals: used to coat welding rods
rutilea reddish-brown to black mineral that consists of titanium dioxide usually with a little iron and has a brilliant metallic or adamantine luster