>Cerium occurs naturally as a mixture with other rare-earth elements in its principal ores bastnaesi
| Item | Result |
| CeO2/TREO | 99.98% |
| TREO | 99.60% |
| La2O3 | 0.01% |
| Pr6O11 | 0.01% |
| Nd2O3 | 0.01% |
| Sm2O3 | 0.01% |
| Y2O3 | 0.01% |
| Eu2O3 | 0.0001% |
| Gd2O3 | 0.0001% |
| Tb4O7 | 0.0001% |
| Dy2O3 | 0.0001% |
| Er2O3 | 0.0002% |
| Tm2O3 | 0.0002% |
| CaO | 0.002% |
| Fe2O3 | 0.009% |
| L.O.I | 0.30 % |