360 



DESCRIPTIVE MINERALOGY. 



Figs. 369, 370, 371, 372, the latter a flattened crystal. 



Fig. 369. Fig. 370. Fig. 371. 



Fig. 372. 



P on I Ul° 9'; P on n 156° 43'; P on o 141° 40' ; P ons 113° 13'; n on n 155° 9'; 

 n on s 102° 26' ; o on o 103° 20' (^Hauy). 



*"'*• ^^' Westchester County. Black tourmaline is found in the gneiss on 



the Croton aqueduct, near the village of Yonkers ; but the crystals 

 are seldom perfect. In a granitic bowlder near New-Rochelle, I 

 found a crystal of a jet black colour, the summit of which is that of 

 the sexdecimale of Haiiy, Fig. 373. 



Warren County. Brown tourmaline has been found in this county. 

 A fine crystal of this kind has the form of Fig. 258. It is in the 

 possession of Dr. Emmons, but I am unacquainted with the precise 

 locality. 



The black variety is found massive, and in large imperfect crystals, 

 associated with feldspar, in the mountains in the vicinity of the village 

 of Caldwell. 



