oxide 149-3.1core 149-3.1rim 149-3.1core 149-3.1rim 149-3.2core 149-3.2rim core 149-3.2rim 155-1core 155-1rim 155-1core 155-1rim 188-3.2Acore 188-3.2Arim 188-3.2Acore 188-3.2Arim SiO2 52.9 53.4 53.03 53.48 52.18 52.7 52.7 52.41 54.23 54.3 54.47 54.21 54.13 54.4 53.74 53.93 TiO2 0.26 0.13 0.34 0.14 0.18 0.09 0.24 0.2 0.18 0.11 0.09 0.06 0.29 0.18 0.32 0.21 Al2O3 0.81 0.6 0.93 0.59 0.58 0.42 0.88 0.73 0.84 0.77 0.75 0.7 1.34 1.08 1.36 1.24 Cr2O3 0 0 0.02 0 0.01 0.01 0.01 0.02 0.02 0 0.01 0.03 0 0 0.01 0 FeO 21.46 21.4 21.05 20.86 24.08 24.08 23.11 23.98 20.25 20.27 19.99 19.97 17.71 16.84 17.61 17.54 MnO 0.54 0.53 0.46 0.48 0.83 0.82 0.83 0.75 0.51 0.36 0.53 0.49 0.4 0.4 0.46 0.38 MgO 22.99 23.41 23.48 23.66 21.31 21.47 21.07 21.33 23.29 23.65 23.83 23.95 25.79 26.52 26.35 26.38 CaO 1.12 0.98 1.29 1.13 0.98 0.92 2.39 1.07 0.83 0.71 0.8 0.77 1.17 0.82 1 0.9 Na2O 0 0 0 0 0.04 0.02 0.08 0.03 0 0 0 0 0.02 0 0.03 0 Total 100.08 100.45 100.6 100.34 100.2 100.54 101.3 100.52 100.15 100.18 100.48 100.18 100.85 100.24 100.87 100.59