Table 2. Mineral Content of Coal Samples Based on XRD.
| mineral relative content (%) | |||||||
|---|---|---|---|---|---|---|---|
| samples | quartz | kaolinite | pyrite | illite | calcite | dolomite | chlorite |
| primary coal | 56.4 | 35.7 | 0.8 | 1.9 | 4.4 | 0.7 | 0.1 |
| tectonic coal | 52.4 | 42.3 | 1.6 | 2.1 | 0.9 | 0.4 | 0.3 |
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