Mineralogy of Jefferson and St. Lawrence Counties, N.Y. 349 
inch to two inches in diameter, but the large crystals are not abun- 
dant. We have the same mineral in small and Jess perfect crystals, 
in a similar gangue, from Grenville, UpperCanada. The specimens. 
of phosphate of lime from this locality, are probably the most remark- 
able both for size and perfection of crystals, that have ever been 
found in the United States. They are found in the lime rock, but al- 
ways within a foot or so of the granite, and are most abundant very 
near the junction of the two rocks. We obtained crystals nearly 
six inches in length, and an inch and a half in diameter. They are 
perfect six sided prisms, of a fine sea-green color, and variously mod- 
ified at their terminations. The smaller crystals are nearly transpa- 
rent, and equally perfect. By continuing the excavation, and removing 
the rock by blasting, which will be attended with considerable labor, 
there is little doubt the mineral may be obtained in any desirable quan- 
tity. 
In another locality in the same field, we met with a-few crystals of 
“smaller size and less perfect inform. It is highly probable that other, 
and perhaps superior localities of these minerals, will be discovered 
whenever this. region is more thoroughly explored. Nearly all the 
rocks that are scattered through the field, and by the road side, contain 
brown tourmaline, in crystals varying from one inch to several inches 
inlength. Indeed crystals six inches in length, and from one to four 
inches in diameter, more or less perfect, are not uncommon. —They 
vary in color from light reddish brown, color of cinnamon stone, to 
dark brown. This mineral is apparently inexhaustible, and may be 
obtained without blasting. 
In the town of Dekalb, eight miles from Cotsiehiar, on the road 
to Ogdensburgh, we find brown tourmaline in very perfect crystals, 
imbedded in tremolite. It is difficult to obtain perfect crystals, on 
account of the tenacity of the tremolite which contains them, but 
although smaller they are more perfect in form, and have a higher 
lustre than the specimens from the locality in Gouverneur. Near the 
bridge across the Oswegatchie river, at the village of Gouverneur, 
we find noble serpentine, in masses, imbedded in limestone of a fine 
green color, capable of taking a fine polis 
One mile below the village of Siceinenn, on the bank of the river, 
we obtain calcareous spar in fine rhombs, translucent to transparent, 
exhibiting double refraction very perfectly. Good specimens can 
be obtained only when the water in the river is quite low. 
In the town of Fowler, twelve miles from Gouverneur, is is a bed of 
bog ore, which contains perfect impressions of the leaves and strobiles 
