176 Sidero-graphite—Fetid fluor Spar. 
ters to this object. Two or three days since one of the lat- 
ter brought me a handful of coal, found in this range, on 
Deep River, in Chatham county, about twenty miles south 
of this place. The coal is highly bituminous, and burns 
with a very clear and bright flame. It is reported that a 
sufficient quantity has already been found to afford an ample 
supply éor the blacksmiths in the neighborhood. 
It is my intention to employ the first leisure I can com- 
mand in collecting more precise and extended informatign 
respecting the formation. 
15. Szdero-graphite. 
Extract of a letter from Dr. Torrey, of New- York. 
I have just discovered a new mineral, or one which I can- 
not find described. It is a compound of metallic iron and 
lumbago. It somewhat resembles laminated plumbago. 
ts specific gravity is 5114; is attracted by the magnet; 
burns when heated intensely, and scintillates ! dissolves in 
great measure in diluted sulphuric acid, giving out much hy- 
drogen gas. I have analysed a small piece, and found, tron 
54:25, plumbago 11°50. I know of no such mineral, and I 
have called it Sidero-graphite. It is found at Schooley’s 
mountain, N. J. but the exact locality is kept a secret by the 
person who found it, as the mineral is supposed to be some- 
thing valuable! I shall soon, however, be able to procure 
two or three small specimens, and I will send you one. 
16. Fetid fluor Spar. 
Mr. Augustus E. Jessup, recently attached to the expe- 
dition up the Missouri, has visited the locality of fluor spar 
near Shawnee* town, Illinois, (Vid. vol. I. p. 52,) and finds 
this mineral very abundant and beautiful. He has observ- 
ed, as he informed us, that this mineral is fetid by friction 
or percussion, and that even the fracture through a natural 
cleavage will diffuse the fetid odour around to the distance 
of two feet or more. We have repeated and confirmed Mr, 
Jessup’s observation. 
“ Not far from the confluence of the Ohio and Miszisippi. 
