Oxide (%) | 1 | 2 | 3 | 4 | 5 | 6 |
SiO2 | 58.49 | 55.26 | 58.26 | 55.28 | 58.76 | 59.15 |
TiO2 | 0.03 | 0.08 | 0.10 | 0.34 | 0.06 | 0.07 |
Al2O3 | 1.59 | 2.94 | 3.30 | 2.86 | 2.64 | 2.27 |
Fe2O3 | 5.78 | 8.52 | 7.15 | 11.35 | 6.99 | 6.60 |
MnO | 0.11 | 0.10 | 0.04 | 0.21 | 0.09 | 0.11 |
MgO | 26.98 | 25.72 | 23.93 | 22.19 | 25.17 | 25.02 |
CaO | 0.24 | 0.77 | 0.11 | 1.74 | 0.47 | 0.50 |
Na2O | 0.10 | 0.03 | 0.02 | 0.03 | 0.03 | 0.02 |
K2O | 0.08 | BDL | 0.04 | 0.02 | BDL | 0.02 |
P2O5 | 0.03 | BDL | 0.01 | 0.03 | BDL | 0.02 |
LOI | 5.60 | 5.50 | 6.10 | 5.00 | 4.80 | 5.30 |