  Relying upon the usefulness of the \mu-\tau symmetry, we find a new type of
neutrino mass texture with a single phase parameter \delta that describes
maximal atmospheric neutrino mixing and Dirac CP violation due to the presence
of \delta. The Majorana phase associated with the third massive neutrino turns
out to be identical to the Dirac phase while other Majorana phases vanish. The
nonvanishing reactor neutrino mixing angle \theta_{13} is induced by a \mu-\tau
symmetry breaking effect. Flavor neutrino masses that supply the \mu-\tau
symmetry breaking terms become pure imaginary for \delta=\pm \pi/2, leading to
maximal CP violation. There is a parameter denoted by \eta, which is either
O(\sqrt{\Delta m^2_\odot/\Delta m^2_{atm}}) in the normal mass hierarchy, or
O(\Delta m^2_\odot/\Delta m^2_{atm}) in the inverted mass hierarchy. In the
inverted mass hierarchy, the contribution of O(\sin^2\theta_{13}) is found to
be significant and cannot be neglected. Our texture also leads to quasi
degenerate neutrinos with masses of O(\sqrt{\Delta m^2_{atm}}), which serves as
the scale for the effective neutrino mass in (\beta\beta)_{0\nu}-decay. This
texture does not include \eta, and \Delta m^2_\odot naturally arises from
contributions of O(\sin^2\theta_{13}) to give \Delta m^2_\odot/\Delta
m^2_{atm}\sim\sin^2\theta_{13}, yielding the prediction of
\sin^2\theta_{13}=O(10^{-2}).
