The rutile structure can be considered as a distorted hcp array of O^2- ions with the Ti⁴⁺ ions occupying the octahedral holes.

The O^2- ions have slightly distorted trigonal planar coordination. This can be seen in the extended structure below.

The unit cell contains:

[1+{8x(1/8)}] = 2 Ti⁴⁺ ions and

[2+{4x(1/2)}] = 4 O^2- ions