Miscellaneous Notices in Mineralogy, Geology, §e. 233 
The only difference between the rock which has so re- 
cently been wrought, and that which is commonly found is, 
that it has a finer texture, and is capable of the highest pol- 
ish—its ROnpNanen being also diffused ina kind of porphy- 
ritic manne 
he mass a ‘each it is taken lies upon the side of a 
hill—in the form of a ledge, and may be split into slabs 
without digging, or any similar difficulty. The Gone, ap- 
pears to be very considerable. 
2 We hae. received fom Dr. B.L. Oliver, handsome pol- 
6. Microscopic crystals of Tron Pyrites. 
Extract of a letter to the Editor, dated Baltimore, Oct. 22, 1820. 
. Tue object of the present _ letter is to send you i inclosed, 
ties of crystals of sulphuret of iron sini l ences they: ¥ ere 
sent to this place from Scotville, Kentucky, as flowers oj 
ver. I pronounced them at once to be Sang and dicta 
them powdered fragments, but the lens betrayed the crys- 
tals, which are beautiful and well defined. I do not recol- 
ides. seeing in any cabinet such small ones, at I feel desi- 
rous that you should possess a specimen. If you think it 
worth while to notice their discovery in oa 
S am vi pruly eae 
can do so. ae ery figs 
These crystals are singularly beautiful ; Shey ae sO mi- 
nute, that they look like brass filings.— —[ Ed]. 
1. Limpid Quartz, from Fairfield, New-York. 
"Localities of quartz are innumerable, ae even trans- 
stals ea ey common, but we have received 
Vou. HL No. 2 30 
seee 
