360 
DESCRIPTIVE MINERALOGY. 
Figs. 369, 370, 371, 372, the latter a flattened crystal. 
Fig. 369. Fig. 370. Fig. 371. 
P on l 117° 9'; P on n 156° 43'; P on o 141° 40'; P on s 113° 13'; n on n 155° 9'; 
n on s 102° 26'; o on o 103° 20' ( Haiiy ). 
Fig. 373. 
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 Ilaiiy, 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. 
