MODE I. GRAPHITE. 



schistose quartz, among the Alpine fragments in 

 the valley of Chamouni -, but upon reaching the 

 rocks, it only formed a kind of gneiss, being thin 

 plates of graphite interposed between layers of 

 quartz, thus assuming as it were the place of 

 foliated mica. 



STRUCTURE I. MASSIVE. 



Aspect 1. Fine. From Borrodale, near Kes- 

 wick, in Cumberland. 



The same, in nodules in the rock already de- 

 scribed. 



The same, as found with columnar coal, from 

 Scotland. 



The same, from the north of Italy, France, &c. 



Aspect 2. Coarse. This is commonly mixed 

 with silex, argil, and other impurities. 



From various parts of France and Germany. 



STRUCTURE II. LAMINAR. 



With laminar quartz, from the valley of Cha- 

 mouni. 



From Arindal, in Norway. 



Laminar graphite, interposed at certain inter- 

 vals in gneiss, from Greipon, in the Alps. Com- 

 municated by Gillet Laumont. 



