| Titanium dioxide has three crystalline forms including anatase, rutile and brookite. |
| In case low concentration of rutile phase is added to anatase phase, photocatalytic properties of titania increase. |
| Among the simple oxides, only anatase and hematite have been found to date. |
| Small well-developed brown anatase crystals replacing larger titanite crystals have been collected from Corral Canyon, Churchill County, Nevada. |
| Minute crystals of brookite have been detected with anatase and rutile in the iron-ore of Cleveland in Yorkshire. |
| It can be classified into anatase, rutile and brokite, of which only anatase and rutile are commercially important. |
