380 



DESCRIPTIVE MINERALOGY. 



Fig. 426. passes through it. The crystals of zircon are of a deep brownish red 



or black colour, some of which are translucent, and of a metallic or 

 bronze lustre. Those in the quartz are often transparent. Some are 

 very minute, while a few are an inch and a half in length. They are 

 usually very brittle, and have imperfect or rounded terminations. 

 The forms. Figs. 415, 417 and 426, dioctaedre of Haiiy, have been 

 observed at this locality. 



In the town of Warwick, at the southern base of Mount Eve, there 

 occur small but perfect four-sided prisms with four-sided pyramids 

 (Fig. 415). They are of a chocolate-brown colour, and are in an ag- 

 gregate of limestone and scapolite. 



Near Amity, there have been found crystals of a brown colour, with . scapolite, reddish 

 garnet, etc. On McGee's hill. Rocky hill, and on Warwick's mountain in the same town, 

 zircon occurs of various colours, as white, reddish brown, reddish white, clove-brown and 

 black. From this town have been obtained the crystals represented in Figs. 415, 417, 418, 

 422, 423, 424 and 426 ; also those here introduced, viz. Figs. 427, 428, 429 and 430. P 

 on M 152° 8' ; Z on s 135° ; Z on M 159° 17'. 



Fig. 427. 



Fig. 428. 



Fig. 429. 



Fig. 430. 



Rockland County. In a granitic bowlder near Ladenton, perfect crystals of zircon have 

 been found of a dark brown and black colour, with quite brilliant surfaces. The crystals are 

 usually of the form represented in Fig. 417, but sometimes the planes x are greatly enlarged. 



St. Lawrence County. Zircon probably will be found in various parts of this county. 

 The finest locality at present known, is at Robinson's in the town of Hammond, near De 

 Long's mills. It is associated with the magnificent crystals of apatite, and with feldspar, in 

 white limestone. The zircon is of a reddish brown colour, in four-sided prisms, some of 

 which are an inch and a half in length and half an inch wide, and are variously terminated. 

 The forms represented in Figs. 416 and 422 have been found at this locality. 



These crystals are sometimes of a lighter colour in the central part, and have a striped or 



