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| Oxide | Analysis | Formula | Tolerance |
|---|---|---|---|
| BaO | 0.03% | - | |
| CaO | 5.08% | 0.33 | |
| K2O | 3.12% | 0.12 | |
| MgO | 3.46% | 0.31 | |
| Na2O | 3.81% | 0.22 | |
| PbO | 0.00% | - | |
| SrO | 0.04% | - | |
| ZnO | 0.02% | - | |
| TiO2 | 0.73% | 0.03 | |
| ZrO2 | 0.03% | - | |
| Al2O3 | 15.40% | 0.55 | |
| P2O5 | 0.27% | 0.01 | |
| SiO2 | 53.50% | 3.25 | |
| Free SiO2 | 5.80% | - | |
| Cr2O3 | 0.03% | - | |
| CuO | 0.01% | - | |
| Fe2O3 | 7.15% | 0.16 | |
| MnO | 0.13% | 0.01 | |
| Oxide Weight | 339.16 | ||
| Formula Weight | 339.16 | ||
An average analysis of the principal ceramic minerals in the earths crust.
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