Table 4 Chemical composition in the gemstones analysed by SEM-EDS (wt%)
Code of dropped gemstones (Fig. 3) | Colour | Identification | Na2O | MgO | Al2O3 | SiO2 | Cl- | K2O | CaO | BaO | PbO |
|---|---|---|---|---|---|---|---|---|---|---|---|
G2 | Violet | Quartz | 1.4 | 0.7 | 98.7 | 0.4 | |||||
G4 | Light violet | Quartz | 0.5 | 99.7 | 0.2 | ||||||
G7 | Light violet | Quartz | 100.0 | ||||||||
A1 | Green | Glass | 5.5 | 1.0 | 82.1 | 0.6 | 0.4 | 5.9 | 4.5 | ||
G1 | Violet | Glass | 13.1 | 1.6 | 82.1 | 1.6 | 1.6 | ||||
G9 | Red | Glass | 1.7 | 0.6 | 73.3 | 0.7 | 2.1 | 0.7 | 21.6 |
