Yellowish or yellow brown helps powder. Density 7. 13g/ cm3. The fusing point is 2397 ¡æ. Not soluble in alkali of hydration, is soluble in the acid a little. At ¡æ temperatures and 15Mpa pressures 2000, can get and oxidize two cerium three times with the cerium oxide of hydrogen reduction, the temperature is dissociated among ¡æ2000, the pressure is dissociated in 5Mpa pressure, it is a little yellow and slightly rufescent that the cerium oxide is presented, there is pink, its characteristics are to do the polishing material.