Table T1. X-ray diffraction peaks used for mineral identification.
|
Minerals
|
2
(°)
|
Peaks
(Å)
|
Intensities
|
|---|---|---|---|
| 14-Å minerals | 6.17-6.25 | 14.11-14.31 | Area |
| 10-Å minerals | 8.75-8.93 | 9.9-10.1 | Area |
| 7-Å minerals | 12.29-12.65 | 7.0-7.2 | Area |
| Quartz | 20.85 | 4.26 | Peak intensity |
| Opal-CT | 21.94-91.97 | 4.046-4.051 | Area |
| Opal-A | * | * | Hump |
| Feldspar | 27.71-28.15 | 3.17-3.20 | Peak intensity |
| Hornblende | 28.43 | 3.14 | Peak intensity |
| Calcite | 29.38 | 3.04 | Peak intensity |
| Clinopyroxene | 30.19 | 2.96 | Peak intensity |
| Dolomite | 30.94 | 2.89 | Peak intensity |
| Halite | 31.71 | 2.82 | Peak intensity |
| Pyrite | 33.06 | 2.71 | Peak intensity |
Note: * Hump of Opal-A = peak intensities at 21.78° (4.081 Å) - [peak intensities at 16° (5.539 Å) + peak intensities at 39° (2.31 Å)] / 2.