Oxides | GB1 | GB2 | GB3 | GB4 | GB7 | GB9 | GB10 | GB13 | GB15 | GB20 |
SiO2 | 12.26 | 4.14 | 5.41 | 3.28 | 6.98 | 4.82 | 3.52 | 10.88 | 6.02 | 5.21 |
TiO2 | 0.48 | 0.64 | 0.59 | 0.75 | 0.78 | 0.60 | 0.72 | 0.64 | 0.67 | 0.71 |
Al2O3 | 0.84 | 0.32 | 0.43 | 0.66 | 0.64 | 0.77 | 0.60 | 0.74 | 0.72 | 0.68 |
FeO | 0.69 | 0.20 | 0.23 | 0.30 | 0.13 | 0.91 | 0.73 | 0.51 | 0.77 | 0.73 |
MnO | 0.84 | 1.09 | 0.08 | 0.09 | 1.13 | 0.09 | 0.10 | 0.12 | 0.08 | 0.11 |
MgO | 0.88 | 1.01 | 1.26 | 0.91 | 0.96 | 1.29 | 1.38 | 1.30 | 1.23 | 1.45 |
CaO | 43.40 | 53.90 | 51.94 | 52.64 | 48.99 | 52.92 | 55.44 | 50.58 | 53.36 | 54.32 |
K2O | 0.65 | 0.45 | 0.49 | 0.42 | 0.81 | 0.54 | 0.60 | 0.50 | 0.42 | 0.79 |
P2O5 | 0.006 | 0.01 | 0.008 | 0.006 | 0.001 | 0.007 | 0.01 | 0.008 | 0.01 | 0.008 |
SO3 | 0.16 | 0.09 | 0.04 | 0.12 | 0.03 | 0.38 | 0.32 | 0.35 | 0.22 | 0.31 |