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Mount Airy

Submitted by Raven Mueller on Wed, 2014-07-09 09:37
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Specimen: 2013-013

This sample is a plutonic rock dominated by mostly anhedral feldspar and a lesser amount of quartz. The crystalline structure is generally coarse. Maximum crystal dimension is 7.5 mm (feldspar) and minimum is .1 mm (quartz). Modal grain size is around 1.5 to 3 mm for feldspar and quartz. Feldspar twinning includes abundant albite and tartan (microcline) patterns with lesser amounts of simple Carlsbad. Grain boundaries range from smooth curving to substantially consertal sutured; the latter predominates. Microperthitic intergrowth patterns involving multiple species of feldspar are common as is zoning in feldspars. Accessory minerals include biotite, which is common at about 5 percent of slide area. Muscovite is also present at around 2 percent of slide area. Opaques are absent in this sample. There is another unidentified mineral present in low quantities (<1 percent) that is uniaxial negative, colorless in ppl, with birefringence of ~.018. There are slight signs of insipient weathering of feldspars with many grains presenting a dusty look.
7/8/2015 MP


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Specimen ID
2013-013 Image of specimen in dry conditions. Finish: Polisheddownload image

Thin Sections

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Specimen ID Non-polarized Cross-polarized
2013-013 Specimen shown in non-polarized image Specimen shown in cross-polarized image


NOTE: Quarry locations are approximate.

Mount Airy Quarry
316-320 Granite Quarry Trail
27030 Mt. Airy , North Carolina
United States
36° 30' 28.296" N, 80° 34' 57.288" W
North Carolina US

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