Table T2. Characteristic X-ray diffraction peaks for semiquantitative analysis of composite clay minerals.
| Mineral | Reflection | d-value (Å) |
Peak position and quantitation method (°2θ) |
|---|---|---|---|
| Composite clay | Multiple | 4.478 | 19.4–20.4 (area) |
| Quartz | 100 | 4.257 | 20.9 (maximum intensity) |
| Cristobalite | 101 | 4.040 | 22.0 (maximum intensity) |
| Quartz | 101 | 3.342 | 26.3–27.0 (area) |
| Plagioclase | 002 | 3.192 | 27.4–28.2 (area) |
| Calcite | 104 | 3.035 | 29.1–29.7 (area) |
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