264 
DESCRIPTIVE MINERALOGY. 
Fig. 157. Fig. 158. Fig. 159. Fig. 160. Fig. 161. 
Fig. 152. P on a 145° 22' ; c on a 159° 50'; c on P 165° 30'; z" on a 111° 15'; zona 
137° 5P; ^ on e 145° 30'; a on e 175° 30' {Shepard). 
Figs. 157, 158, 159, 160. P on a 145° 22'; P on t 154° ; P" on t 103° 50'; Jonz 155° ; 
r on t 133° 50'; z on a 137° 5P; P on c 165° ; e on z 145° {Horton). 
Fig. 161 ( bis ). 
Fig. 162. 
Jefferson County. On the banks of Vrooman lake, in the 
vicinity of the village of Oxbow, crystallized quartz is found 
in cavities and geodes, associated with crystallized calcareous 
spar. The crystals are small, usually regular six-sided prisms 
with six-sided pyramids. These sometimes cross each other 
at right angles, as in the accompanying Fig. 161 (bis). They 
are translucent and transparent, and occasionally have a yel¬ 
lowish tint. 
In the same town (Antwerp), at the Sterling ore bed, crys¬ 
tallized quartz is associated with the specular iron, and is often 
coated with the rare Cacoxenite. These crystals, which are usually 
limpid, but are occasionally tinged by oxide of iron, have the prisms 
very short, as in Fig. 144 ; or entirely wanting, forming the dodecaedre 
of Haiiv, Fig. 162. They are similar to those which occur in St- 
Lawrence county, but are smaller. 
It is a curious fact, that the cavities in which these crystals occur, 
often contain pure water or a colourless liquid. The same thing, how¬ 
ever, has been observed in regard to geodes of quartz and other crystals 
at various localities, both American and foreign.* 
See Brewster's Edinburgh Journal of Science. X. 24 and 28. 
