56 
CORUNDUM IN THE UNITED STATES. 
[BULL. 18( 
corundum deposits in this country. It is situated about 8 miles south 
east of Franklin, the county seal, on the northeast side of Cullasage< 
Creek, a tributary of the Little Tennessee River. 
The corundum found at this mine occurs in peridotite rock, am 
this has been worked very extensively, especially near the contact o 
this rock with gneiss. PI. VII gives a general view of this peridotit 
formation, and shows to a certain extent the number of openings tha 
have been made in it. The hill is about 350 feet high, the summi 
being about 500 feet above the level of Oullasagee Creek. Fig. 10 i 
Dunite. <;neixs. Mica-schist. 
Fig. 10.— Map of the peridotite formation at Corundum Hill. Macon County. N. ('. 
a topographic map of this same peridotite formation, and shows 
location of the various mines. The formation is a rather blunt le 
shaped mass of the dunite variety of peridotite, and has about 
acres of surface, over most of which the rock is exposed. As is s< 
from this map, most of the mines are located near the contact of 
dunite with the gneiss or schist, and follow contact veins of cor 
dum. A number of dunite veins have been worked within the Con 
tion, but with the exception of the one marked "Shaft" on the in 
they have all soon pinched out. 
