268 
DESCRIPTIVE MINERALOGY. 
Fig. 169. 
Figs. 135, 136, 149, also occur at this locality, with several other 
more common forms. 
Crystallized quartz is also found abundantly at Flatbush in this 
county. Fig. 173 represents a compound crystal from that loca¬ 
lity. 
Fie. 174. 
Fig. 175. 
Warren County. On the islands in Lake George, and especially on Diamond island, four 
miles north of the village of Caldwell, very beautiful transparent crystals of quartz were for¬ 
merly found in considerable abundance, in the cal- 
ciferous sandstone. They were generally six-sided 
prisms, often with pyramidal terminations, and were 
sometimes four or five inches long, either loose or in 
cavities in the rock. One of these forms, described 
and figured by Dr. G. Troost, the Quartz unibinaire 
of Flaky (Fig. 174), is a hexahedral prism with the 
edges of their bases bevelled. P on o 128° 20k 
In the same group were several of this form, and 
one having some of the solid angles of the prism 
truncated, forming a combination of the rhombifere 
of Ilaiiy, and of the unibinaire, as in Fig. 175. 
These crystals were from a quarter to half an inch 
in length, and were found associated with calcareous spar.* 
Troost. Journal of the Academy of Natural Sciences of Philadelphia. II. 212, 
