  We present high precision measurements of elliptic flow near midrapidity
($|y|<1.0$) for multi-strange hadrons and $\phi$ meson as a function of
centrality and transverse momentum in Au+Au collisions at center of mass energy
$\sqrt{s_{NN}}=$ 200 GeV. We observe that the transverse momentum dependence of
$\phi$ and $\Omega$ $v_{2}$ is similar to that of $\pi$ and $p$, respectively,
which may indicate that the heavier strange quark flows as strongly as the
lighter up and down quarks. This observation constitutes a clear piece of
evidence for the development of partonic collectivity in heavy-ion collisions
at the top RHIC energy. Number of constituent quark scaling is found to hold
within statistical uncertainty for both 0-30$\%$ and 30-80$\%$ collision
centrality. There is an indication of the breakdown of previously observed mass
ordering between $\phi$ and proton $v_{2}$ at low transverse momentum in the
0-30$\%$ centrality range, possibly indicating late hadronic interactions
affecting the proton $v_{2}$.
