In virtually all cases, titanium achieves octahedral coordination geometry.
Li2TiO3 is not considered an orthotitanate since it adopts the rock-salt structure and does not feature an identifiable titanium anion.
[3] The solid is unstable with respect to loss of water and formation of titanium dioxide.
Some, like the commercially important mineral ilmenite (FeTiO3), crystallize in the hexagonal close packing motif seen in corundum.
Alternatively, some materials with the formula MTiO3 crystallize in the motif known as perovskite, which is also the name of the mineral form of calcium titanate (CaTiO3).