Localities of Minerals. 241 
New locality of erystalized sulphat of Barytes, §c.—Com- 
municated in a letter by D. B. Dovaxass, assistant pro- 
fessor in the West Point Military Academy, : 
During my excursion to the northwest, last summer, as. 
astronomer to the Boundary Commissioner, I was enabled 
to make a considerable collection of minerals ;—among the 
test, a rich one of Niagara specimens; also some very 
‘air specimens of organic remains from fort Erie—upon the 
islands at the West end of Lake Erie, I obtained sulphat of 
barytes, which is found both in crystals, and in mass, in 
great abundance, in the western islands above mentioned. 
he crystals are very flat hexagonal prisms, clustered to- 
gether rather confusedly, and adhering very slightly to each 
other ; they are generally very clear and pellucid, some- 
times tinged with blue. 
Localities of Minerals —Gommunicated by Dr. I. F. Dana. 
Tremolite, (bladed,) abundant, and of a fine quality at 
Chester, N. H. at. 
Plumbago, in small rolled masses, and in small veins, in 
Micaceous schistus, at Chester, N. H. Some specimens 
are very fine, and in laminz, as large as the hand and half 
ick 
Localities of Minerals.—By the Rev. Mr. Schaeffer of 
New-York. 
Pistazite, (Epidote,) in beautiful crystals, occurred in a 
tock of singular constitution, composed 0 schorl, quartz, 
cubic, [euboidal? as the cube is not among the orms of ear- 
bonate of lime,—Ed.] crystals of carbonate of lime, indico- 
lite, &e. and an ore, the nature of which is not yet ascer- 
tained. It is probable, however, that 1t may contain nickel. 
Corlaer’s Hook, New-York, discovered nearly three years 
Cy 
Pittasite (epidote,) amorphous, or rather granular,—oc- 
eursina ferruginous green feldspar rock; Rhinebeck, Dutch- 
ess County, N. ¥.—observed last summer. 
