Pratt — Origin of the Corundum, etc. 



49 



Art. Y. — On the Origin of the Corundum associated 

 toith the Peridotites in Worth Carolina • by J. H. Pratt. 



[Published by permission of the Director of the North Carolina Geological Survey.] 



Introduction. — During the past few years there have been 

 numerous investigations upon the character and origin of the 

 peridotite (dunite) rocks of the Appalachian belt, especially 

 those occurring in the southern portion of this belt. In a 

 recent paper, J. Y. Lewis* has shown that these peridotites are 

 to be regarded as plutonic igneous rocks. 



The author has examined nearly all the known outcrops of 

 these rocks, in this State, during the past two years, in connec- 



tion with his work on the corundum deposits. The result of 

 these examinations have led to the same conclusion regarding 

 the origin of the peridotites as that held by Prof. Lewis and 

 others. Corundum is nearly always associated with these 

 rocks ; and while several valuable contributions have been 

 written on the occurrence and descriptions of localities, but 

 few investigators have taken up the study of this mineral in 



*Elisha Mitchell, Sci. Soc. Jour., Part II, pp. 24-37, 1895. 



Am. Jour. Sci.— Fourth Series, Yol. VI, No. 31.— July, 1898. 

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