Download Guidebook as .pdf (2.2 Mb) - Carolina Geological Society
Download Guidebook as .pdf (2.2 Mb) - Carolina Geological Society
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2008 annual meeting – Spruce Pine Mining District: Little Switzerland, North <strong>Carolina</strong><br />
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Table 1. Modal and chemical composition of coexisting plagiocl<strong>as</strong>e and K-feldspar<br />
in samples of LUF1 pegmatite.<br />
Plagiocl<strong>as</strong>e Crystals<br />
plagiocl<strong>as</strong>e<br />
host<br />
exsolved<br />
K-feldspar<br />
pre-exsolution<br />
bulk<br />
composition<br />
sample modal % mole % Ab modal % mole % Ab mole % Ab<br />
2 98.7 90.2 1.3 4.6 89.1<br />
8 99.0 90.2 1.0 4.6 89.2<br />
10 96.6 90.7 3.4 4.6 87.8<br />
16A 100 91.3 0 nd 91.3<br />
nd = not determined<br />
K-Feldspar Crystals<br />
K-feldspar<br />
host<br />
exsolved<br />
plagiocl<strong>as</strong>e<br />
pre-exsolution<br />
bulk<br />
composition<br />
sample # modal % mole % Ab modal % mole % Ab mole % Ab<br />
2 98.0 7.1 2.0 98.1 9.0<br />
8 89.8 6.0 10.2 98.2 15.4<br />
10 89.1 6.0 10.9 98.2 16.0<br />
16A 95.3 5.9 4.7 98.1 10.2<br />
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Page 26<br />
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