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 2. Representative white mica compositions from the LUF1 pegmatite.<br />
sample number and texture*<br />
1 cg* 1 fg 7 cg 7 fg 10 cg 12cg 17 cg 17 mg 17 fg 18 cg<br />
SiO 2 45.47 47.93 45.40 46.14 45.78 45.75 45.66 45.85 46.66 46.06<br />
Al 2 O 3 29.77 28.79 29.15 27.59 28.61 28.83 30.06 29.77 30.28 29.74<br />
TiO 2 0.42 0.01 0.16 0.12 0.18 0.15 0.12 0.13 0.41 0.09<br />
FeOt 5.93 3.96 6.08 6.33 6.05 6.53 5.86 6.20 4.76 6.14<br />
MgO 0.98 1.19 1.01 1.27 1.08 1.14 1.04 1.07 1.24 1.08<br />
MnO 0.05 0.07 0.05 0.03 0.07 0.12 0.10 0.06 0.09 0.05<br />
CaO 0.00 0.11 0.00 0.00 0.00 0.00 0.01 0.00 0.03 0.01<br />
Na 2 O 0.35 0.31 0.33 0.24 0.40 0.32 0.43 0.39 0.34 0.37<br />
K 2 O 11.01 8.17 10.46 10.69 10.68 10.71 10.82 10.79 10.49 10.89<br />
F 0.18 0.16 0.25 0.36 0.29 0.30 0.23 0.27 0.22 0.24<br />
Total 93.86 90.70 92.89 92.77 93.16 93.85 94.32 94.53 94.53 94.67<br />
Cations b<strong>as</strong>ed on 11 oxygens<br />
Si 3.1740 3.3465 3.1969 3.2639 3.2208 3.2036 3.1686 3.1800 3.1990 3.1876<br />
Al 2.4493 2.3691 2.4196 2.3002 2.3721 2.3791 2.4587 2.4331 2.4467 2.4258<br />
Ti 0.0064 0.0006 0.0084 0.0065 0.0098 0.0078 0.0062 0.0065 0.0210 0.0049<br />
Fe 0.3459 0.2312 0.3582 0.3744 0.3560 0.3823 0.3400 0.3594 0.2731 0.3551<br />
Mg 0.1018 0.1237 0.1061 0.1338 0.1135 0.1188 0.1071 0.1105 0.1272 0.1117<br />
Mn 0.0032 0.0042 0.0032 0.0017 0.0039 0.0069 0.0060 0.0034 0.0049 0.0030<br />
Ca 0.0000 0.0080 0.0000 0.0000 0.0000 0.0000 0.0005 0.0000 0.0024 0.0010<br />
Na 0.0474 0.0415 0.0446 0.0325 0.0550 0.0438 0.0575 0.0531 0.0457 0.0493<br />
K 0.9802 0.7281 0.9395 0.9646 0.9587 0.9566 0.9581 0.9543 0.9179 0.9612<br />
F 0.0395 0.0358 0.0558 0.0800 0.0608 0.0675 0.0488 0.0595 0.0484 0.0516<br />
* fg = fine grained, mg = medium grained, cg = coarse grained<br />
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Page 27<br />
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