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Table 1 Representative Electron Microprobe Analyses of Uraninite from Spruce Pine Pegmatites
1 2 3 4 5 6 7 8 9 10 11 12 13
SiO2 0.11 0.08 0.38 0.33 0.27 0.06 BDL 0.12 0.15 BDL 0.30 0.31 BDL
ZrO2 0.22 BDL BDL 0.18 BDL BDL 0.54 0.20 BDL BDL BDL BDL BDL
UO2 88.20 85.12 80.21 88.18 91.79 92.30 80.68 81.93 82.66 83.20 79.60 87.12 91.45
ThO2 2.86 1.50 0.78 4.42 1.54 2.63 6.04 7.23 4.35 1.59 1.53 2.31 2.47
PbO 4.65 4.54 3.64 4.69 4.35 5.52 4.15 4.51 4.58 3.84 3.64 3.92 4.98
CaO 0.23 2.82 10.56 0.19 0.30 0.05 0.45 0.18 0.25 0.33 12.07 0.38 0.07
Y2O3 1.31 0.62 BDL 1.38 0.48 0.25 1.95 1.11 1.68 6.81 BDL BDL BDL
F BDL 0.49 2.86 BDL BDL BDL BDL BDL BDL 0.21 2.43 BDL BDL
Total 97.58 95.17 98.43 99.37 98.73 100.81 93.81 95.28 93.67 95.98 99.57 94.04 98.97
O=F -0.21 -1.20 -0.09 -1.02
94.96 97.23 95.89 98.55
Cations on basis of 2 oxygens
Si 0.005 0.004 0.014 0.015 0.012 0.003 0.000 0.006 0.007 0.000 0.011 0.015 0.000
Zr 0.005 0.000 0.000 0.004 0.000 0.000 0.012 0.005 0.000 0.000 0.000 0.000 0.000
U 0.902 0.856 0.666 0.879 0.929 0.931 0.848 0.858 0.878 0.825 0.650 0.925 0.941
Th 0.030 0.015 0.007 0.045 0.016 0.027 0.065 0.077 0.047 0.016 0.013 0.025 0.026
Pb 0.058 0.055 0.037 0.057 0.053 0.067 0.053 0.057 0.059 0.046 0.036 0.050 0.062
Ca 0.011 0.137 0.422 0.009 0.015 0.002 0.023 0.009 0.013 0.016 0.475 0.019 0.003
Y 0.032 0.015 0.000 0.033 0.012 0.006 0.049 0.028 0.043 0.161 0.000 0.000 0.000
F 0.000 [0.070] [0.337] 0.000 0.000 0.000 0.000 0.000 0.000 [0.030] [0.282] 0.000 0.000
Sum 1.043 1.082 1.146 1.042 1.037 1.036 1.050 1.040 1.047 1.064 1.185 1.034 1.032
Columns: 1 - Deer Park; 2,3 - Goog Rock; 4 - Pink; 5 - Chestnut Flats; 6 - Polly Randolph; 7 - Wiseman (inclusion in samarskite-(Y)); 8,9 - Field;
10 - Carolina No. 20; 11-13 - Deake
BDL = below limit of detectability
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