N | 2-theta | d, Å | Minerals | Chemical formula and amount of minerals | Crystal symmetry, space group and lattice parameters (Å) |
1 | 20.83 | 4.25 |
| SiO2 |
|
2 | 26.19 | 3.34 | Quartz | SiO2 | Hexagonal, P3221, a = 4.91, c = 5.40 |
3 | 27.50 | 3.23 |
| Na[AlSi3O8] |
|
4 | 27.87 | 3.19 | Albite | Na[AlSi3O8] (27.55%) |
|
5 | 29.44 | 3.03 | Anorthite | Ca(Al2Si2O8) (9.21%) | Monoclinic, I(−1), a = 8.18, b = 12.86, c = 14.16 |
6 | 33.12 | 2.70 | Hematite | α-Fe2O3 (8.49%) | Rhombohedral, R(−3)c, a = 5.03, c = 13.74 |
7 | 35.48 | 2.52 |
| α-Fe2O3 |
|
8 | 36.38 | 2.45 |
| SiO2 |
|
9 | 39.37 | 2.28 |
| SiO2 |
|
10 | 42.36 | 2.12 |
| SiO2 |
|
11 | 50.00 | 1.81 |
| SiO2 |
|
12 | 50.69 | 1.79 |
| SiO2 |
|
13 | 59.86 | 1.54 |
| SiO2 |
|
14 | 67.44 | 1.36 |
| SiO2 |
|