ZIRCONIA. 



379 



faces highly finished, but they are exceedingly brittle. The forms observed here, are the 

 prisme of Haiiy, Fig. 415, being the primary with the edges of the base truncated ; the modi- 

 fication of the same, Fig. 416 : the plagiedre of Haiiy, Fig. 417 ; the quadrisexdecimal of 

 Hauy, Fig. 418 ; together with those represented in Figs. 419, 420, 421, 422, 423 and 424. 



Fig. 415. 



Fig. 416. 



Fig. 417. 



Fig.-419. 



4^^ 



Fig 425. 



P on I 131° 49' ; P on M 152° 8' ; P on a; 150° 5' ; Z on Z 90° ; Z on m 159° 17' ; I on x 



142° 55'. 



Orange County. Zircon is of frequent occurrence in the towns of 

 Cornwall, Monroe and Warwick. In the Forest of Dean, in the town 

 of Monroe, it is found in very minute crystals in scapolite, associated 

 with pyroxene. Near the outlet of the Two ponds in the same town, 

 it also occurs in scapolite, and associated with crystallized pyroxene 

 and sphene. These crystals are sometimes more than an inch in 

 length, and exhibit the forms represented in Figs. 415 and 417 as above, 

 and in the accompanying Fig. 425, hinotriunilaire of Haiiy. P on s 

 117° 48'; P on t 152° 6' ; P on a; 150° 5'; I on s 135°; I on x 

 142° 55'. On Deer hill in the town of Cornwall, a mile southeast of 

 the village of Canterbury, there is an abundant locality of zircon, 

 which is accociated with magnetic iron ore, or the white quartz which 



