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Table 8 Composition of fergusonite (sample 1348)

From: Bristen granite: a highly differentiated, fluorite-bearing A-type granite from the Aar massif, Central Alps, Switzerland

Point 16 17 34 35
Nb2O5 42.63 40.19 41.09 41.94
Ta2O5 0.95 0.82 0.88 0.65
TiO2 0.54 0.41 0.30 0.48
ThO2 2.14 2.10 2.27 2.20
UO2 5.93 6.21 5.85 6.40
Y2O3 17.94 18.27 21.03 18.29
La2O3 0.01 0.02   
Ce2O3 0.15 0.22 0.07 0.24
Pr2O3 0.11 0.14 0.19 0.05
Nd2O3 1.81 1.87 1.51 1.35
Sm2O3 1.17 1.11 1.41 0.99
Gd2O3 3.28 3.49 3.80 3.10
Dy2O3 4.32 4.29 4.50 3.77
Er2O3 3.75 3.95 3.63 3.33
Yb2O3 3.55 3.69 3.48 3.57
FeO 1.79 1.26 0.87 1.71
CaO 0.96 0.98 0.99 0.99
Total 91.06 88.91 91.89 89.10
Nb 0.986 0.967 0.956 0.991
Ta 0.013 0.011 0.012 0.009
Ti 0.020 0.016 0.011 0.018
Th 0.024 0.025 0.026 0.025
U 0.065 0.071 0.065 0.072
Y 0.472 0.500 0.557 0.492
La 0.000 0.000 0.000 0.000
Ce 0.003 0.004 0.001 0.004
Pr 0.002 0.003 0.003 0.001
Nd 0.032 0.034 0.027 0.024
Sm 0.020 0.020 0.024 0.017
Gd 0.054 0.060 0.063 0.052
Dy 0.069 0.071 0.072 0.061
Er 0.058 0.064 0.057 0.053
Yb 0.054 0.058 0.053 0.055
Fe 0.074 0.054 0.036 0.072
Ca 0.051 0.054 0.053 0.054
sum 2.047 2.058 2.017 2.003
Nb + Ta 1.006 0.979 0.969 1.002
Cat–Nb–Ta 0.903 0.963 1.000 0.910
  1. Oxides in wt%, stoichiometry per 4 oxygens, with all Fe as Fe2+