Fron Mines, &c. in Vermont. 23 
nite, though dull and merely translucent in their splinters, 
which emit a greenish light. 
Its composition I found to be in the 100 parts 
Silex - - - 33, 0 
Magnesia - - - 42,0 
Lime - = = 3,50 
Iron - - - med 
Water and volatile matter 13, 0 
100 
The composition of this variety, deducting the iron and 
small portion of lime, as well as that of Loudan grove near 
Chester, a few miles from Philadelphia, is also very well 
suited for the manufactory of Epsom salt. 
Art. Il.—Notice of Fron mines and manufactures in Ver- 
mont, and of some localities of earthy minerals ; by Pro- 
ressor I. Hau, in a letter to the Editor, dated 
Middlebury College, April 12, 1821. 
In my last communication, I promised you a description 
of some of the other iron ore beds of Vermont. I have 
since examined the one situated in Brandon, a town sixteen 
miles south from this place. The ore bed, lying about two 
miles north from the centre of the town, is owned by a 
number of gentlemen; two of whom are John Conant and 
Roger Fuller, Esqrs. of Brandon. The ore is found by 
digging a few feet below the surface, in a horizontal plain, 
extending several miles in length, and from fifty to a hun- 
dred rods in width. Where this plain now is, I could not 
help imagining, was once a deep valley, which, at a remote 
period, was filled with mineral matter, brought down from 
the Green mountain, by which it is bounded, on the east. 
The ground being covered with snow, when I visited the 
ore bed, I had no opportunity to examine the surface of the 
earth. An ore digger, who has long resided on the spot, 
gave me all the information in his power, relative to the 
