Table 1 Mineralogical composition of five samples based on X-ray diffraction (XRD) analysis.
Sample | Mineral composition and content (%) | ||||||
|---|---|---|---|---|---|---|---|
Quartz | Feldspar | Calcspar | Chlorite | Kaolinite | White mica | I/S | |
A | 12 | 8 | 7 | 5 | – | – | 68 |
A 200 ℃ | 13 | 7 | 5 | 2 | – | 10 | 63 |
A 350 ℃ | 11 | 7 | 6 | 6 | – | 7 | 63 |
A 500 ℃ | 13 | 8 | 1 | 6 | – | 15 | 58 |
B | 5 | 5 | 8 | 10 | – | 5 | 67 |
B 200 ℃ | 4 | 9 | 12 | 4 | – | 8 | 67 |
B 350 ℃ | 4 | 6 | 6 | 3 | – | 10 | 71 |
B 500 ℃ | 5 | 12 | 8 | 2 | – | 13 | 60 |
C | 3 | – | 8 | 8 | – | 4 | 77 |
C 200 ℃ | 3 | – | 8 | 8 | – | 4 | 77 |
C 350 ℃ | 4 | 3 | 9 | 4 | – | 8 | 72 |
C 500 ℃ | 4 | 3 | 13 | 4 | – | 18 | 68 |
D | 5 | 4 | – | 2 | 10 | – | 79 |
D 200 ℃ | 6 | 3 | 1 | 3 | 12 | – | 75 |
D 350 ℃ | 5 | 1 | 1 | 3 | 7 | 1 | 82 |
D 500 ℃ | 6 | 2 | – | 2 | 8 | 8 | 74 |
E | 4 | – | 12 | 6 | – | – | 78 |
E 200 ℃ | 8 | 5 | 10 | 6 | – | – | 71 |
E 350 ℃ | 5 | 1 | 11 | 5 | – | – | 78 |
E 500 ℃ | 4 | 2 | 12 | 4 | – | – | 78 |
