Help me with Packing factor

[Pucca]

As I know the TiO₂ structure (anatase and rutile) has tetragonal arrangement. This is also in agreement with the first pauling rule, in which the structural coordination can be estimated from the ratio of ionic radius between cation (Ti₄+ = 0.42 A, for 4 coordination number)
and (O₂- = 1.21 A, for 2 coordination number, and gives the ratio C/A = 0.34 which is fall to the tetrahedral structure)

As also mentioned in some literature, there are 3 kinds of packing density for various structures: CCP (cubic close packed), HCP (hexagonal close packed) and BCC (body centered cubic). Some literature mention that Ti metal belong to the HCP (hexagonal close packed), which I could not understand how this could be since in my mind, I think that TiO₂ structure is actually tetragonal.

[peter]

I may confirm that anatase and rutile has tetragonal arrangement and Ti metal has hexagonal. Why it should contradict to each other?