Rutile is an oxide mineral composed of titanium dioxide (TiO2), the most common natural form of TiO2. Rarer polymorphs of TiO2 are known, including anatase, akaogiite, and brookite.

Rutile is a commercially important titanium mineral, and has minor uses in porcelain and glass manufacture as a coloring agent and in making some steels and copper alloys.

This particular specimen is a single crystalized rutile, you can see the striations of the formation on the side.