y 
56 
[Assembly 
Plaster of Pans or gypsum, description of, 49 
Gypsum of Herkimer county, 50 
Gypsum beds of Oneida county, 51 
Gypsum beds of Madison county, 52 
Localities of gypsum in Onondaga county, 53 
Gypsum of Monroe county, 54 
Gypsum of Cayuga, Wayne, Livingston, 
Ontario, Seneca and Tompkins counties, 55 
Localities of gypsum in Niagara, 56 
Value of this mineral,, 57 
Remarks concerning the origin of gypsum, 58 
Description of Lake Sodom, in Onondaga 
county, 59 
The formation of gypsum and sulphuretted 
hydrogen referable to a common cause, . 60 
Earthy minerals of the State, general nog 
tice of, 61 
Magnesian minerals of Richmond county, 62 
Serpentine and verd antique of the coun- 
ties of New- York, Westchester, Putnam, 
Rockland, Orange and St, Lawrence, . . 63 
Soapstone of Richmond and St. Lawrence, 64 
Asbestus and Amianthus, 65 
Materials for the ma.nufecture of porcelain, 66 
Clays of Long-Island, Staten-Island, and 
of Orange county, 67 
Localities of feldspar, < 68 
Importance of the manufacture, 69 
Localities of native iron, 70 
Extent of the beds of iron ore in Northern 
and Southern New- York, 71 
New localities of magnetic iron ore in Or- 
ange county, 72 
Analysis of several ores of iron, 73 
Oxide of manganese and its localities in 
New- York, 74 
Table of the composition of specimens 
from various parts of the State, 75 
Lead mines of the county of Sullivan, .... 76 
Varieties of galena found at these mines, . . 77 
Pyritous copper associated with the galena, 78 
Sulphuret of zinc associated with the above, 79 
Prospects of success at these mines, 80 
Occurrence of silver in the lead ores of Sul- 
livan and St. Lawrence, , 81 
Lead mines of Ulster county, 82 
Importance of the lead mines of St. Law- 
rence county, , 83 
Titanium found in the metallic form in Or- 
ange and St. Lawrence counties, 84 
Titanic acid and its localities, 85 
Arsenical minerals found in New- York, ... 86 
Very interesting locality of, in Orange co. 87 
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