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Table 7 Yttrocolumbite

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

Nb2O5 35.4 Nb 0.884
Ta2O5 5.8 Ta 0.084
ThO2 1.8 Sum A 0.968
UO2 31.6 Th 0.022
Y2O3 6.5 U 0.375
Nd2O3 0.2 Y 0.184
Sm2O3 0.1 Nd 0.004
Gd2O3 0.8 Sm 0.003
Dy2O3 0.8 Gd 0.014
Er2O3 2.7 Dy 0.014
Yb2O3 2.8 Er 0.044
FeO 5.7 Yb 0.045
CaO 1.2 Fe2 0.253
   Ca 0.071
Total 95.4 Sum B 1.030
   Total cations 1.997
  1. La,Ca, Pr in traces, ideal cations = 2; ideal oxygens = 4