Table 5.
Content of the main impurity elements (wt%) in Carrara marble and deposits (dust, moss and primary soil) on its surface.
| Component | Marble | Dust | Biodeposits | |
|---|---|---|---|---|
| Sam.M1v | Sam.M1s | |||
| Na2O | 0.01 2 | 3.0 1 | 1.6 1 | 1.6 1 |
| MgO | 0.17 2 | 4.0 1 | 3.7 1 | 2.0 1 |
| Al2O3 | 0.088 2 | 16.6 1 | 9.9 1 | 9.1 1 |
| SiO2 | 0.01 2 | 11.1 2 | 36.5 3 | 50.7 3 |
| K2O | 0.009 2 | 8.0 1 | 3.5 1 | 2.3 1 |
| CaO | 99.0 2 | 3.0 2 | 4.3 3 | 5.2 3 |
| TiO2 | 0.066 2 | 1.8 1 | 0.8 1 | 0.6 1 |
| MnO | 0.01 2 | 0.2 1 | 0.13 1 | 0.1 1 |
| FeO | 0.019 2 | 1.5 2 | 8.2 3 | 5.2 3 |
Notes: 1 ICP analysis; 2 Electron probe microanalysis; 3 X-ray fluorescence analysis.