The chemical composition typical for fire clays are 23-34% Al2O3, 50-60% SiO2 and 6-27% loss on ignition together with various amounts of Fe2O3, CaO, MgO, K2O, Na2O and TiO2. Chemical analyses from two 19th-century sources, shown in table below, are somewhat lower in alumina although a more contemporary source quotes analyses that are closer.
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| Fire clay compositions | ||||||||
|---|---|---|---|---|---|---|---|---|
| Thorpe | King | Shackelford | ||||||
| Stonebridge | Eisenberg I | Eisenberg II | Newcastle 1 | Newcastle 2 | Newcastle 3 | N/A | ||
| SiO2 (%) | 65.10 | 89.8 | 64.7 | 51.1 | 47.6 | 48.6 | 58.1 | |
| Al2O3 (%) | 22.2 | 5.40 | 24.0 | 31.4 | 29.5 | 30.2 | 23.1 | |
| MgO (%) | 0.18 | 0.09 | 0.40 | 1.54 | 0.71 | 1.91 | 1.00 | |
| CaO(%) | 0.14 | 0.20 | 0.37 | 1.46 | 1.34 | 1.66 | 0.08 | |
| Iron Oxides (%) | 0.18 | 0.09 | 0.40 | 4.63 | 9.13 | 4.06 | 2.40 | |
| K2O (%) | 0.18 | 0.61 | 2.40 | not given in the text | ||||
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