Fit 316. 



ALUMINA. 

 Fig. 317. . Fig. 318. 



339 



Fig. 319. 



Fig. 320. 



Saratoga County. Crystallized feldspar or adularia, asso- 

 ciated with chrysoberyl, tourmaline, garnet, etc., is found in 

 a vein of coarse granite passing through gneiss, in the town 

 of Greenfield, about a mile north of Saratoga-Springs. It is 

 white, translucent, and often has a coating of silvery mica. 

 The forms observed at this locality are those represented in 

 Fig. 307, and Figs. 320, 321, 322, and 323. P on a; 128° 51'. 



Fi?. 322. 



Fk. 323. 



Suffolk County. At Cow bay, feldspar of an apple-green colour has been obtained in 

 considerable quantities.* 



Warren County. Feldspar, affording large cleavages, of a white colour, is found in con- 

 siderable abundance on the mountain about two miles west of the village of Caldwell. 



On French mountain, three miles south of the same village, there is a vein of feldspar or 

 adularia, containing small quantities of magnetic iron ore, which has been soninwhat worked. 



* Pierce and Torrcy, Ckavclmd's Mineralogy. 



