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Electron microprobe analysis of brucite and calcite
| Mineral | Brucite | Calcite |
| No. of analyses | 5 | 5 |
| MgO | 68.121 | 0.048 |
| CaO | 0.016 | 55.485 |
| Al2O3 | 0.002 | na |
| SiO2 | 0.030 | 0.004 |
| FeO | 0.018 | 0.011 |
| TiO2 | 0.034 | na |
| Na2O | 0.013 | na |
| Cr2O3 | 0.018 | na |
| CoO | 0.020 | na |
| NiO | 0.003 | na |
| MnO | 0.012 | 0.027 |
| K2O | 0.006 | na |
| SO3 | 0.007 | na |
| F | 0.397 | na |
| Cl | 0.009 | na |
| sum | 68.299 | 55.574 |
| H2O | 31.295 | — |
| CO2 | — | 44.426 |
H2O and CO2 are calculated by difference; na, not analyzed.
