Sample | MG1B | MG1B | MG1B | MG1B | MG3D | MG3D | MG1D |
Analyse N˚ | 3 | 5 | 6 | 18 | 23 | 27 | 29 |
SiO2 | 50.1 | 48.12 | 47.79 | 47.07 | 47.85 | 47.37 | 47.77 |
Al2O3 | 32.38 | 32.4 | 31.79 | 30.35 | 31.47 | 30.94 | 29.76 |
TiO2 | 0.22 | 0.37 | 0.98 | 1.95 | 2.04 | 1.37 | 2.87 |
FeO | 3.38 | 3.04 | 3.76 | 4.07 | 3.24 | 3.81 | 3.66 |
MnO | 0 | 0 | 0.08 | 0.02 | 0.12 | 0.06 | 0 |
MgO | 1.25 | 1.27 | 1.5 | 1.57 | 1.17 | 1.35 | 1.55 |
CaO | 0 | 0 | 0.04 | 0.02 | 0.03 | 0.04 | 0 |
Cr2O3 | 0 | 0.04 | 0.07 | 0 | 0.02 | 0.01 | 0.07 |
Na2O | 0.14 | 0.21 | 0.22 | 0.15 | 0.1 | 0.08 | 0.08 |
K2O | 9.07 | 10.56 | 10.21 | 10.8 | 10.26 | 10.45 | 10.64 |
TOTAL | 96.54 | 96.01 | 96.44 | 96 | 96.3 | 95.48 | 96.4 |
Structural formula (8 Oxygen) |
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Si | 6.55 | 6.4 | 6.35 | 6.33 | 6.35 | 6.37 | 6.38 |
Al | 4.99 | 5.08 | 4.98 | 4.81 | 4.93 | 4.91 | 4.68 |
Z | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
ALIV | 1.45 | 1.6 | 1.65 | 1.67 | 1.65 | 1.63 | 1.62 |
ALVI | 3.53 | 3.47 | 3.33 | 3.14 | 3.28 | 3.28 | 3.06 |
Ti | 0.02 | 0.04 | 0.1 | 0.2 | 0.2 | 0.14 | 0.29 |
Fe | 0.37 | 0.34 | 0.42 | 0.46 | 0.36 | 0.43 | 0.41 |
Mn | - | - | 0.01 | 0 | 0.01 | 0.01 | - |
Mg | 0.24 | 0.25 | 0.3 | 0.31 | 0.23 | 0.27 | 0.31 |
Ca | - | - | 0.01 | 0 | 0 | 0.01 | - |
Cr | - | 0 | 0.01 | - | 0 | 0 | 0.01 |
Ni | - | - | - | - | - | - | - |
Na | 0.04 | 0.05 | 0.06 | 0.04 | 0.03 | 0.02 | 0.02 |
K | 1.51 | 1.79 | 1.73 | 1.85 | 1.74 | 1.79 | 1.81 |
TOTAL | 26.7 | 27.02 | 26.93 | 26.82 | 26.79 | 26.85 | 26.59 |
XFe | 0.6 | 0.57 | 0.58 | 0.59 | 0.61 | 0.61 | 0.57 |