SILICA. 
267 
inch to three or four in length, and are transparent or translucent. The six-sided prism with six- 
sided pyramids is common; and 
there are 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 are 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. 
Fig. 166. Fig. 167. Fig. 168. 
Emmons. New-York Geological Reports, 1837. 
