Description | Brookite is a polymorph with two other minerals. The minerals rutile and anatase, as well as brookite, all have the same chemistry, TiO2, but they have different structures. At higher temperatures, about 750 degrees Celsius, brookite will automatically revert to the rutile structure. Rutile is the more common and the more well known mineral of the three. Brookite shares many of the same properties as rutile such as color and luster and some properties are nearly the same such as hardness and density. However, due to structural differences brookite and rutile differ in crystal habit and cleavage. |