Pseudobrookite Tialite Armalcolite
Formula Fe2TiO5 Al2TiO5 Mg.5Fe.5Ti2O5
Form.Wt. 239.591 181.860 215.876
Z 4 4 4
CrystalSystem Orth Orth Orth
PointGroup mmm mmm mmm
SpaceGroup Bbmm Bbmm Bbmm
UnitCell
a(Å) 9.767 9.429 9.7762
b(Å) 9.947 9.636 10.0214
c(Å) 3.717 3.591 3.7485
Vol 361.12 326.27 367.25
MolarVol 54.375 49.128 55.298
Density 4.406 3.702 3.904
Thermal Expansion(Volumetric)
alpha
a0