20 Journal of the Mitchell Society [June 



Some portions of the rock are rich in garnet, others are almost 

 entirely free from this mineral, and occasionally there are 

 also small bands of white quartzite. 



Corundum in Amphibole-Schist: — At the Sheffield mine, in 

 Cowee Township, Macon County, I^orth Carolina, corundum 

 has been found in a saprolitic rock which is apparently altered 

 amphibole-schist, which was originally a rock belonging to the 

 gabbroid family. 



The corundum does not occur in crystals, but in small frag- 

 ments and in elongated nodules, which are cracked and seamed 

 and appear to have been drawn out by the shearing processes. 

 The general character and shape of the fragments of corundum 

 would indicate that they were original constituents of the 

 igneous rock and were not formed during its metamorphism. 



Corundum in Chlorite- Schist : — Besides being associated with 

 chlorites in the peridotites and pyroxenites, already mentioned, 

 corundum is found in the long belts of chlorite-schist that tra- 

 verse the country 10 or 12 miles southeast of Webster, Jackson 

 County, ISTorth Carolina. These chlorite rocks, which some- 

 times attain a width of several hundred feet, are traceable for 

 miles across the country. Almost the only constituent of these 

 rocks is a green, scaly chlorite, though sometimes there are 

 present small grains of feldspar, and occasionally needles of 

 amphibole. The chlorite is in small scales, never very coarse, 

 as is sometimes the case in the zones about the peridotite, and 

 often these scales are so minute as to give the rock a very com- 

 pact appearance. 



The best corundum for abrasive purposes that was ever found 

 was obtained from the Croat Laurel Creek mine, Rabun County, 

 Georgia. This corundum will bring the highest price on the 

 market, and there was and always has been a demand for this 

 variety of corundum. 



CHEOMITE^ 



With the exception of alluvial deposits, chromite has been 

 found only in the peridotites and allied igeneous basic magnesian 



* United States Geological Survey, Mineral Resources, 1901, pp. 841-948. IMd. 

 North Carolina Geological Survey, Vol. I, 1905, pp. 369-384. 



