Powell quarry, Stone Mountain-Lithonia Mining District, DeKalb County, Georgia, USAi

Regional Level Types
Powell quarry	Quarry
Stone Mountain-Lithonia Mining District	Mining District
DeKalb County	County
Georgia	State
USA	Country

A 25 acre, slightly dome-shaped mass of Lithonia gneiss located south of Bradley and Arabia Mountain is owned by M. D. Powell of Klondike. One large and five small openings have been worked on various parts of the property. The present working is about 300 feet wide in an east-west direction and three to five feet high.

The rock is highly contorted Lithonia gneiss with many dikes and veins of white aplite filling northerly trending shear zones. In places where the banding is consistent, mainly on the south side of the exposure near the contact with mica schist, the banding strikes about N70°W and ranges in dip from 60°S to 60°N. The number of shear zones and the amount of deformation of the banding also decrease rapidly as the contact is approached.

Garnet-rich, epidote-bearing bands are common in this exposure and are often faulted along the northeasterly trending shear zones. Large, black tourmaline crystals up to six inches long and more than one inch thick are found in some pegmatite dikes. Locally the tourmaline forms radiating clusters within the gneiss.

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