Chemical formula: TiO2
Melting point: No data
Density: 4.1-4.14 g/cm3
Microhardnes: No data
Hardness (Moh's): 5.5-6
Luminescence: Non-fluorescent
Crystal system: Orthorhombic
Cell dimensions: a=5.436 A, b=9.166 A, c=5.135 A
PDF number: 00-002-0514
ICSD number: 036408
Note: 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.

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