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An anatase is a blue or brown mineral, a form of titanium dioxide, used as a pigment.
The difference in the crystal structure of the anatase phase and rutile phase
Rutile, TiO2, is an oxide.
An interesting mineral, most unusual for being trimorphous with anatase and rutile.
Titanium oxide is also called titanium dioxide. It is a compound and occurs in the minerals rutile, anatase and brookite.