No. 50.] 99 
tions of sulphate of lime to which it gives rise. A chalybeate spring 
has also been found here. 
Among the objects deserving the attention of the mineralogist, I 
should by no means omit the locality of iron pyrites in the vicinity of 
the Court-House. This mineral is so common that it would not be de- 
serving of particular notice were it not for the interesting crystalline 
forms which it here presents. 
The following minerals may also be added, as having been found in 
this county. 
Anthracite — In small quantities, associated with calcareous spar. 
Satin spar — In the caverns. 
Fluor Spar — Near Schoharie. Rare. ' 
Sulphate of iron and alum, in efflorescences. 
Sulphate of strontian, probably several varieties — Near the Court- 
House. 
SENECA COUNTY. 
The mineralogy of this county is exceedingly limited. Of the use- 
ful minerals, we notice only some important beds of gypsum, near Se- 
neca-Falls. These are extensively wrought, and large quantities of 
this valuable substance are sent from them to the west and south, by 
the Erie canal and by Seneca lake. The amount annually obtained 
from these beds is said to be 5,000 to 6,000 tons. 
Petroleum is found floating on Seneca lake and on the surface of 
springs, and, as if to give colour to the opinion that it originates from 
coal, small quantities of that mineral are also found. There are some 
other mineral springs in this county, of which the most interesting is 
that described by Mr. Hall in his last report. It is a pool about twenty 
feet in diameter, near Canoga, and from it nitrogen gas is said to be 
constantly and abundantly evolved. 
To the above it is only to be added, that a variegated marble occurs 
near Seneca lake, and hornstone or quartz is often found in the lime- 
stone. 
STEUBEN COUNTY. 
All that is known concerning the mineral resources of thh county can 
be comprised in a single sentence, and it is, that it contains several 
