We report the homonuclear photoassociation (PA) of ultracold Cr-52 atoms in an optical dipole trap. This constitutes the measurement of PA in an element with total electron spin (S) over tilde > 1. Although Cr, with its S-7(3) ground and P-7(4,3,2) excited states, is expected to have a complicated PA spectrum we show that a spin-polarized cloud exhibits a remarkably simple PA spectrum when circularly polarized light is applied. Over a scan range of 20 GHz below the P-7(3) asymptote we observe two distinct vibrational series each following a LeRoy-Bernstein law for a C-3/R-3 potential with excellent agreement. We determine the C-3 coefficients of the Hund s case (c) relativistic adiabatic potentials to be -1.83 +/- 0.02 and -1.46 +/- 0.01 a.u.. Theoretical nonrotating Movre-Pichler calculations enable a first assignment of the series to Omega = 6(u) and 5(g) potential energy curves. In a different set of experiments we disturb the selection rules by a transverse magnetic field which leads to additional PA series.