SILICA. 



267 



Fig. 166. 



Fig. 107. 



inch to three or four in length, and arc transparent or translucent. The six-sided prism with six- 

 sided pyramids is common ; and 

 there arc also found the forms re- 

 presented in Figs. 143 and 147, in 

 Fig. 166, and the twins 167 and 

 168. 



Near Grass lake, in the same 

 town with the preceding, quartz 

 is found in rounded and smooth 

 masses, from the size of a pea to 

 that of a pigeon's egg, having the 

 lustre and other characters of hya- 

 lite. These masses seem to have 

 been crystals which have been 

 either wholly or partially fused. They arc often penetrated by crystals of feldspar, and are 

 found adhering to gneiss.* This is probably the variety to which Mr. Dana, in his Mine- 

 ralogy, refers under the head of Hyalite. 



Jaspery iron, or iron flint, is found at the Parish ore bed. 



Saratoga County. According to Mr. Mather, quartz crystals are found in considerable 

 abundance, in a rock intermediate between the calciferous sandstone and the limestone, in 

 Galway in this county. 



In the blue limestone near Saratoga-Springs, agate, passing into hornstone, is found. It is 

 blue and white, and is sometimes beautifully striped, but the masses are not large. 



Sullivan County. Crystallized quartz, usually in druses, and associated with galena, 

 zinc, blende, copper and iron pyrites, is found at the well known lead mine two miles from 

 the village of Wurtzboro'. This deposit is in a coarse sandstone, called millstone grit. The 

 specimens are inferior to those found in the same range, and with the same associations, in 

 Ulster county. 



Ulster County. In the town of Wawarsing, near the Red bridge, and also near the vil- 

 lage of Ellenville, crystallized quartz has been found in excavations which have been made 

 for lead and copper ores. The associates are similar to those which occur in Sullivan county. 

 At the Red bridge mine, a vast quantity of these crystals were obtained during the explora- 

 tions which were carried on a few years since. These crystals were usually opaque and im- 

 planted, but were often translucent and doubly terminated. They have been found of from 

 two to four inches in length. 



At the Ellenville mine, the crystals are usually transparent, but they are much smaller than 

 those from the preceding locality. Some interesting forms have been observed, which are 

 represented on the next page, viz : Figs. 169, 170, 171, 172. 



* Emmons. New-York Geolo^Kal Rc-ports, 1837. 



