Localities of Minerais. Q4y 
.Vew locality of erystalized sulphat of Barytes, &c.—-Com- 
mumcated in a letter by D. B. Douerass, 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 mmerals ;~—-among the 
rest, a rich one of Niagara specimens; also some very 
fair 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. 
The 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 —— Communicated by Dr. I. F. Dana. 
Tremolite, (bladed,) abundant, and of a fine quality at 
Chester, N. H. 
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 
an inch thick. 
Epidote.—Epidote, very beautiful, in radiating crystals, in 
Exeter, N. H. 
Localities of Minerals.—By the Rev. Mr. Schaeffer of 
New-York. 
Pistazite, (Epidote,) in beautiful crystals, occurred in a 
rock of singular constitution, composed of schorl, quartz, 
cubie, [cuboidal? as the cube is not among the forms of car- 
bonate of lime,—Ed.] crystals of carbonate of lime, indico- 
lite, &c. and an ore, the nature of which is not yet ascer- 
tained. It is probable, however, that it may contain nickel. 
Corlaer’s Hook, New-York, discovered nearly three years 
ago. 
Pistazite (epidote,) amorphous, or rather granular,—oc- 
cursina Cee green feldspar rock ; Rhinebeck, Dutch- 
ess County. N. ¥.—-observed last summer. 
