The Stone Mountain Granite, east of Atlanta, Georgia, was investigated to determine mineralogic variation in the exposed area. Four variables were used: quartz content, total feldspar content, microcline-to-oligoclase ratio, and muscovite-to-biotite ratio. The first three variables indicate mineralogic variation paralleling the east-west structural trend of the granite area, and suggest by their distribution that the granite was emplaced in two distinct intrusions.

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