SILICA. 
265 
Fig. 163. Fig. 164. 
Lewis County. Near Natural bridge, in the town of 
Diana, large opaque or semi-transparent crystals occur, 
with one or both terminations perfect, in a vein in the 
sandstone. In addition to several common forms, those 
represented in Figs. 163 and 164 have been noticed at 
this locality. About a mile and a half north of Natural 
bridge, drusy quartz occurs abundantly in geodes in 
the sandstone. The colours are white, reddish and 
bluish white. 
Monroe County. Small masses of hornstone, sometimes resembling calcedony, have been 
found in the vicinity of the city of Rochester. 
Montgomery County. At Palatine, quartz crystals occur, having one end terminated by 
a regular hexahedral pyramid, while the other is globular and smooth as if fused. 
Near Spraker’s basin, both in the towns of Root and Palatine, druses of quartz crystals of 
considerable beauty are found, associated with calcareous spar, in the calciferous sandstone. 
Masses of aggregated crystals are sometimes found coloured with oxide of iron, and which 
may be called ferruginous quartz. Hornstone and coarse agate are also abundant. 
New-York County. I am not aware that crystallized quartz is met with in any quantity. 
Inferior specimens are occasionally found in the gneiss. Dr. Gale refers to a locality in the 
Harlem railroad cut, about 122d-street.* Rolled masses of jasper, usually red, but some¬ 
times brown, as well as the striped variety, have been found on various parts of the island 
with hornstone. Near Kingsbridge, the quartz is sometimes fetid. 
Ontario County. According to Mr. Hall, small geodes, lined with calcedony, occur in 
the sandstone at Vienna, on Flint creek.f 
Orange County. The slate in this county sometimes embraces beds of quartz. Some of 
them may be seen on a cross-road from Bellvale to Thomson’s pond. In dip and direction, 
they coincide with the slate in which they are embraced. Some of them are from ten to 
twenty feet in width. The quartz of these deposits is granular, columnar and crystallized. 
The crystals, however, are not usually perfect.I 
Four miles east of the village of Warwick, the primary form (Fig. 129) occurs in cavities 
in jasper. The crystals are small, but very perfect. At this locality, also, are found speci¬ 
mens of calcedony coating cavities in the jasper. 
At Rocky hill, in the town of Warwick, there are found crystals which vary from translu¬ 
cent to opaque, of a reddish and yellowish white colour, and which resemble Haytorite. But 
the specimens which I have seen, although unlike any of the crystalline quartz with which I 
am acquainted, are too imperfect for accurate measurement. 
Crystals similar to those represented in Figs. 130 and 131, have been found near Craig- 
ville ; and those similar to Fig. 132, both blue and white, occur in Warwick. 
* New-York Geological Reports , 1839. 
Min. — Part II. 
t Ibid. 
$ Horton. Ibid. 
34 
