30 ECONOMICAL MINERALOGY. 



The following is the composition of a specimen of the shot ore : 



Peroxide of iron, 72 . 37 



Silica and alumina, ._ 15. 43 



Water, 12.20 



Dungings Mine, a short distance from the preceding, has ores of a similar character. 



In consequence, chiej9y, of the scarcity of fuel, no furnaces have been erected in the im- 

 mediate vicinity of these deposits. The ore, however, has been transported in considerable 

 quantities, and is said to afford a valuable iron. 



On Long Island brown hematite is often met with in detached masses, but no important or 

 extensive beds of it have as yet been made known. 



On the Island of New-York, bog iron ore is of frequent occurrence, but the quantities of 

 it are entirely too small to answer any valuable purpose. It is most usually reddish brown, 

 cellular, and contains much oxide of manganese.* 



Westchester County. A bed of hematite, apparently of a good quahty, is found on the 

 farm of Mr. James Ammerman, about a mile and a half north of the county poor house, and 

 four or live miles east-northeast of Tarrytown. Several tons of ore have already been ob- 

 tained from this bed, and it is thought to be extensive. It is associated with white hmestone ; 

 and Mr. Mather states, that tiiis range of rock reaches the banks of the Hudson, a short 

 distance below Dobbs' Ferry .t 



Bog iron ore occm-s a mile and a half south of Sing-Sing, but it has heretofore only been 

 obtained in quantities sufficient for cabinet specimens. 



Again, the varieties of this species, usually denominated Red Ochre and Red Chalk, occur 

 in some abundance on the farm of H. I. Cruger, Esq. in Cortlandtown. 



Rockland County. Thin veins of the hematitic ore, probably associated with oxide of 

 manganese, are found on the banks of a small stream, two miles west of the village of 

 Ramapo. 



A dark browii, nearly black, oxide of iron, occurs near Haverstraw, which deserves only 

 to be noticed from the fact, that it was mistaken for the oxide of manganese ; in consequence 

 of which, the bed of ore was represented as being of great value. When subjected to the 

 action of the blowpipe, the mineral becomes strongly magnetic. It is easily fusible with borax, 

 but does not communicate a violet tinge to it. 



Orange County. There are in this county several localities of limonite, in its several 

 varieties. It rarely, however, occurs in sufficient abundance to be worked as jm ore. 



Two and a half miles west of the village of Canterbury, in the town of Cornwall, is a mine 

 of limonite, belonging to Mr. Thomas Townsend. The ore occurs massive, and in a variety 

 of imitative forms. In some parts of the bed it is filled with organic remains. Large quan- 



* Pierce and Torrey. CUaveland's Mineralogy. Second Edition. t New-York Geological Reports, \S>" 



