M = Metal / O = Oxide / E = Element / G = Gas / C = Carbonate / CI = Chloride
Iron
| Isotopes | Chemical form | Natural abundance % |
| 54Fe | O,M | 5.8 |
| 56Fe | O,M | 91.7 |
| 57Fe | O,M | 2.2 |
| 58Fe | O,M | 0.3 |
| Isotopes | Chemical form | Natural abundance % |
| 54Fe | O,M | 5.8 |
| 56Fe | O,M | 91.7 |
| 57Fe | O,M | 2.2 |
| 58Fe | O,M | 0.3 |
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