Download Guidebook as .pdf (2.2 Mb) - Carolina Geological Society
Download Guidebook as .pdf (2.2 Mb) - Carolina Geological Society
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Table 5 Comparison of niobate-tantalate minerals at Maw Bridge and Spruce Pine<br />
Samarskite-(Y) Fergusonite Pyrochlore Group<br />
1 2 *3 4 5 6<br />
Nb2O5 42.11 40.23 36.85 35.77 8.89 6.12<br />
Ta2O5 11.31 11.45 13.77 13.70 49.25 41.71<br />
TiO2 1.46 1.70 0.16 1.19 6.29 10.59<br />
ZrO2 0.08 0.39 BDL BDL BDL BDL<br />
UO2 16.16 14.62 5.82 7.50 15.45 25.93<br />
ThO2 1.20 1.51 0.40 1.19 BDL BDL<br />
Sc2O3 0.35 0.87 0.05 0.08 0.13 0.12<br />
Y2O3 6.25 9.29 26.54 26.46 BDL BDL<br />
REE2O3 7.68 7.71 9.05 12.04 BDL BDL<br />
CaO 0.33 0.12 1.51 0.84 11.74 12.09<br />
FeO 10.64 10.34 BDL BDL 0.66 0.25<br />
MnO 0.52 0.68 BDL BDL 0.23 0.06<br />
PbO 1.09 0.45 0.65 0.31 0.83 0.84<br />
Na2O BDL NA BDL NA 1.90 2.11<br />
Total 99.18 99.36 95.20 99.08 95.37 99.82<br />
Columns: 1 - Samarskite-(Y) from Peterson mine, Spruce Pine; 2 - Samarskite-(Y)<br />
from Maw Bridge pegmatite; 3 - Fergusonite from W. W. Wiseman mine, Spruce<br />
Pine; 4 - Fergusonite from Maw Bridge pegmatite; 5 - Uranoan microlite from<br />
McKinney mine, Spruce Pine; 6 - Betafite from Maw Bridge pegmatite<br />
BDL = below limit of detectability<br />
*Contains 0.40 weight percent F<br />
NA = not analyzed<br />
Spruce Pine analyses are from this study (Table 3); Maw Bridge pegmatite data are<br />
from Warner and Fleisher (2004)<br />
page 52
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