Titanium Dioxide Brookite type
TiO2
Chemical name
Titanium Dioxide Brookite type
Mineral name
Brookite
Chemical formula
TiO2
Crystal system
orthorhomic
Crystal Class
dipyramidal (2/m 2/m 2/m)
Unit cell
a [Å]:5.4558
b [Å]:9.1819
c [Å]:5.1429
Molecular weight [g/mol]
79.88
Formula units
Z=8
Twinning
on {120}, uncertain
Mohs hardness
5.5 - 6
Density [g/cm3]
4.08 - 4.18
Cleavage
poor on {120}, in traces on {001}
Color
brown, yellowish brown or black
Optical character
biaxial (+)
Refractive Index
nα=2.583; nβ=2.584; nΥ=2.700
Birefringence δ
0.117