It is a very interesting fact that the beta-BaB2O4 (BBO) crystals are grown both by the flux method and the Czochralski (CZ) method from a stoichiometric melt. Defects in the BBO crystals grown by these two methods were examined in detail by light scattering tomography (LST). Many narrow and extremely thin platelets were optically observed on the rhombohedral (R) planes of the CZ and also of the Aux-grown BBO crystals. This phenomenon of very similar defects being observed in both crystals is unique, because defects in crystals usually depend on how they were grown.