CORUNDUM TN UNITED STATES. 
117 
MA(<)X COUNTY 
Corutidiiin Hill inhic. — Coriindmn was first discovered in Macon 
County in 1870 at wliat is known as the Corundum Hill mine, and 
niinino' was begun here about a year later. This mine has become one 
of the most imj)()rtant corundum (le])osits in this country. It is sit- 
uated about iS miles southeast of Franklin, the county seat, on the 
northeast side of Cullasao-ee Creek, a ti'ibutary of the Little Tennes- 
see River. 
Dunite. Gneiss. Mica-schist. Conuiduiii workings. 
Pig. 18. — Map of the peridotite formation at <'oniiidum Hill, Macon County, N. C. 
The corundum found at this mine occurs in peridotite rock, which 
has been worked very extensively, especially near the contact of this 
rock with gneiss. PL IX gives a general view of this peridotite for- 
mation, and shows to a certain extent the number of openings that 
have been made in it. The hill is about 350 feet high, the summit 
being about 500 feet above the level of Cullasagee Creek. Fig. 18 is 
a topographic map of this same peridotite formation, and shows the 
location of the various mines. The formation is a rather blunt lens- 
shaped mass of the dimite variety of peridotite, and has about 10 
