MAGNETIC OXIDE OF IRON. 
13 
A specimen of the magnetic sand from the banks of the Moose, gave, upon analysis, the 
following results, viz : 
Silica and titanic acid,.„ „.. 5.16 
Magnetic oxide of iron,. 94.84 
Washington County. An extensive bed of magnetic iron ore occurs in the town of Fort- 
Ann, four miles north of the village of the same name; the ore, however, is largely mixed 
with black garnet, granular and crystalline hornblende. There are also similar deposits near 
Mount-Hope furnace in Fort-Ann. The ore is magnetic, and sometimes exhibits polarity. It 
lies in beds, sometimes pure, and sometimes intermixed with garnet, coccolite or hornblende. 
Some other localities are noticed by Mr. Mather.* 
The following is the composition of a specimen of magnetic iron ore from Fort-Ann: 
Protoxide of iron,. 42.26 
Peroxide of iron,.. 53.69 
Insoluble matters,. 4.05 
Warren County. The magnetic oxide of iron is found on French mountain, three miles 
south of the village of Caldwell, and some expense has been incurred in the excavations 
which have been made. The ore is strongly magnetic, and possesses polarity. It is usually 
massive, but octahedral crystals are also occasionally obtained. The associates are white and 
red feldspar, of which large and handsome cleavages are abundant. These sometimes contain 
grains of quartz. As a locality of iron ore, this is of very little consequence. Aside from 
the great difficulty of access, there is as yet no evidence that the ore exists here in any 
quantity. 
At Warrensburgh, near the East river, twelve miles from the village of Caldwell, this 
mineral has been found in beds of considerable extent, and has there been worked by the 
bloomery process. In one of these beds the ore was at first of good quality, but it gradually 
changed its character when the mining was continued, until at length it became unfit for use. 
This ore has a granular structure, the grains being of various sizes and colours, and evi¬ 
dently consisting of different minerals. It is easily reduced to powder, and the grains are 
sometimes held together by so feeble a cohesion, that they may be separated by a slight blow 
of a hammer. The whitish or transparent particles are usually about the size of a pin’s head, 
are scratched by fluor spar, and effervesce with acids. Small scales, of a steel grey colour, 
which soil the fingers and give a blackish trace upon paper, are also disseminated through the 
mass. 
From this description it is evident that the results of the analyses of this ore must be more 
or less discordant. The following is the mean of several trials : 
Magnetic oxide of iron,. 70.80 
Carbonate of lime,. 25.00 
Plumbago,. 3.00 
Silica, and loss,. 1.20 
New-York Geological Reports, 1841. 
