191Jf^ Ceetain Mineral Resoueces 19 



bolites and peridotites, and never constitute more tlian an in- 

 significant part of the outcrops. 



Corundum in Pegmatite: — Occurrences of corundum in 

 pegmatite are extremely rare, but it has been found in this rock 

 in two localities in Haywood County, jSTorth Carolina. One is 

 at Retreat, on Pigeon River, 6 miles southeast of Waynesville, 

 where corundum occurs in small pegmatite dikes, cutting the 

 saprolitic, garnetiferous gneisses or schists. Accompanying these 

 dikes are thin seams of vermiculites that also carry corundum. 

 The other locality is three miles northeast of Canton, at the 

 Presley mine, where corundum occurs in a pegmatite which 

 intersects a mass of dark-green amphibolite. The corundum is 

 found surrounded by both feldspar and mica. 



Corundum in Serpentine : — At a number of peridotite lo- 

 calities in ISTorth Carolina and Georgia crystals and fraginents 

 of corundum have been found that were surrounded by serpen- 

 tine, but nowhere in the Southern Appalachian region has corun- 

 dum been found associated with the larger masses of serpentine 

 that have been derived from the alteration of the peridotites, as 

 at several localities in Buncombe County, ISTorth Carolina. 



Corundum in Gneiss: — Corundum is found in N'orth Caro- 

 lina in the ordinary gneiss of the same belt of crystalline rocks 

 in which the peridotites occur. It is also found in garnetifer- 

 ous gneiss in Clay County, l^orth Carolina. In several other 

 places in Clay County attempts have been made to mine corun- 

 dum that occurred in the hornblende gneiss. 



Corundum in Mica-Schist : — Corundum in mica-schist has 

 been observed at a number of widely separate localities in Vir- 

 ginia, North Carolina, and South Carolina; but in none of 

 them has corundum been found in large quantities. 



Corundum in Quartz- Schist: — It has recently been ob- 

 served that portions or bands of the crystalline rocks of the 

 southeastern part of Clay County, North Carolina, and the 

 northeastern part of Towns County, Georgia, are corundum 

 bearing. These rocks vary in composition from those that are a 

 normal gneiss to those that contain no feldspar and can best be 

 described as quartz-schist composed of quartz and biotite mica. 



