292 



DESCRIPTIVE MINERALOGY. 



instances, the regular crystalline forms pass into the granular variety, which assumes various 

 shades of colour from light green to nearly jet black. 



In the tovm of Monroe, there are several interesting localities. One of the most noted of 

 these is at the Two ponds, where it is associated with scapolite in large crystals, zircon and 

 sphene, in white limestone. The colour is green to greyish green and brown. It is both 

 massive and crystallized. The forms observed are the primary (usually small), six and eight- 

 sided prisms with one terminal plane, Figs. 193 and 195 ; the dihexaedre of Haiiy, Fig. 205> 



Fig. 203. 



Fig. 205. 



Fig. 20C. 



Fig. 207. 



Fig. 208. 



the size of the different planes being subject to great variation, M or M' on s 121'^ 48', P 

 on s 150'^ 0', s on s 120° 38', r on t 106° 6' ; the quadrioctonal of Haiiy, Fig. 206 ; together 

 with the forms represented in Figs. 207, 208 and 209. Sometimes these crystals are of large 

 size, and are variously grouped. 



About half a mile east of Greenwood furnace, in the same town, is another locality of 

 pyroxene, which has afforded a great abundance of beautiful and interesting crystals.* The 

 mineral is here associated with crystallized mica, which is equally worthy of attention. The 

 colours of the pyroxene are green, greyish green, and ash grey. Among the forms are the 

 primary and Fig. 195 ; together with those represented by Figs. 210, 211, 212 {perioctaedre 

 of Haiiy), 213 {bisunitaire of Haiiy), 214 {octoduodecimal of Haiiy). 



Fig. 210. 



Fig. 211. 



M 



M' 



M 



M 



\ 



Fig. 212. 



I r 



Fi?. 213. 



Fig. 214. 



* For a notice of this locality, see American Jorumal of Science. VIII. 



