We developed a novel growth route for oxide crystals in the Ca-Mn-O system. Single crystals of CaMn2O4 and CaMn3O6 were obtained by heating starting Na0.44MnO2 polycrystalline samples in molten CaCl2 salt at 950 and 850 degrees C, respectively. The as-grown CaMn2O4 crystals were black in color; they also had a polyhedral shape with a maximum dimension of 0.7 x 0.5 x 0.3 mm(3). In the case of CaMn3O6, needle-like single crystals having average lengths of up to 0.2 mm were successfully grown at 850 degrees C for the first time.