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| | Stone Mountain |
 | | The East Quarry was operated by the Stone Mountain Granite Corporation from 1916 to 1934, and by the Works Progress Administration (WPA) from 1935 to 1940 (Herrmann, 1954). |
 | | The Stone Mountain granite is light gray and fine- to medium-grained, consisting of quartz, plagioclase, microcline, muscovite, and biotite (Size and Khairallah, 1989). |
 | | Several types of xenoliths are present in the Stone Mountain granite, including biotite, muscovite-biotite, garnet-mica schists, biotite-plagioclase gneiss, granite gneiss, and less commonly, tourmaline mica-schist with centimeter-sized tourmaline crystals (Grant et al., 1980). |
| gpc.edu /~pgore/stonemtn/stonemountain.html (2115 words) |
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