Table 2 Main elemental composition at different positions on the sample surface
EI | Atom. C (at.%) | |||
|---|---|---|---|---|
Dot 1 | Dot 2 | Dot 3 | Dot 4 | |
S | 26.44 | 17.79 | 1.66 | 0.80 |
Ca | 69.27 | 67.07 | 86.98 | 89.29 |
Fe | 0.26 | 5.13 | — | — |
Si | 2.67 | 6.45 | 5.5 | 4.72 |
Al | 0.87 | 2.18 | 1.42 | 1.06 |
Mg | 0.50 | — | 3.88 | 4.13 |