ALUMINA. 327 



Tlie garnet at this locality is sometimes associated with minute, loosely aggregated crystals 

 of calcareous spar, and with coccolite. 



According to Dr. Emmons, crystallized brown garnet occurs in the town of Crown-Point, 

 and other varieties are found at Long pond. 



Montgomery County. Garnet of a pink colour is abundantly disseminated in the gneiss 

 and granite in the town of Palatine, about two miles southeast of Sprakcr's basin. It is in 

 small grains and dodecahedrons, which usually have the edges rounded. 



New York County. Brown garnet, with twenty tra]iezoidal 

 faces (Fig. 278), usually quite imperfect, is abundant in the gneiss 

 on the banks of the Hudson between 42d and .'JOth-slrcets, and in 

 bowlders in every part of the island.* 



Oneida County. Brown granular garnet occurs in the bowlders 

 which are so abundantly met with in the vicinity of Boonville. It 

 is associated with tabular spar and green pyroxene. 



Orange County. There are several localities of garnet in this 

 county, but it is usually granular or massive. 

 Near Amity, it is found of a reddish colour. About a mile and a quarter southwest of the 

 same village, it is of a cinnamon colour, and is occasionally crystallized. In this vicinity, 

 also, it occurs in crystals of a pale and deep red and wine-yellow colour, which, although usu- 

 ally small, are sometimes several inches in aiametcr. The yellow ones are very perfect and 

 transparent, and exactly resemble the variety from Fassa in the Tyrol. Some of the granu- 

 lar specimens are scarcely to be distinguished from those from Rogers' rock in Essex county. 

 Of the crystalline forms here observed, there are the primary (Fig. 270), and the modification 

 (Fig. 271). 



At the O'Neil iron mine, in the town of Monroe, garnet occurs in the form of imperfect 

 crystals and grains of a red colour, in granite. 



About four miles west of Soullificld furnace, in the same town, the variety colophonitc is 

 found associated with magnetic iron ore. It consists of very small grains, which are red, red- 

 dish brown and almost black, and very brilliant. Before the blowpipe, it fuses with effer- 

 vescence into a shining black bead, wliich is slightly magnetic. 



Saratoga County. In the town of Greenfield, about a nnic north of Saratoga Springs, 

 crystallized garnet is found associated with tourmaline, chrysoberyl, etc., in a vein of granite. 

 The crystals have trapezoidal faces (Fig. 278), and are of a reddish brown colour. They 

 sometimes half an inch in diameter, but arc seldom perfect. 



Suffolk County. Garnet and iron sands are often found along the coast of Long island. 

 These sands are more abundant after storms, a fact of some interest as connected with the 

 mode of their production. In the notice of magnetic iron sand (page 22), I have adverted to 

 the theory which has l.iccn commonly received in regard to its occurrence, viz. that it pro- 



* Gale. Niw-Vark Geologicat Rrports, 1839. 



