Miscellaneous Localities of Minerais. 57 
is fine grained, with but little mica, except in some veins, 
which seem almost completely formed of it—feldspar white, 
quartz limpid, with a bluish tint. Part of the granite re- 
tains its a colours, but the greater part is deeply stain- 
brown yellow, with oxide of iron. Some points of 
it are ofa. Senta! pink colour, as if stained: with manga- 
nese. e minuter fragments consist of the quartz and 
felspar, covered with delicate incrustations of: minute crys- 
tals of sulphur, having the appearance of su ted 
-phur. The sulphur is sometimes pale yellow, but has most- 
ly a greenish tinge—much of the sulphur came to hand in 
the state of powder full of crystals of wron pyrites, from the 
size ofa pea down to the minutest grains. The explana- 
tion of this appearance seems easy—the centre of the gran- 
ite probally formed a geode, lined or filled with pyrites. 
a taneous decomposition, attended with the extri- 
cation of heat, ars sulphur ‘was. sublimated, and the iron 
converted into oxide has stained the stone 
This apparently ubimportant fact t may “have no little 
weight in settling the question of the origin of volcanoes. 
It may have been only on a very small scale, what Alma 
is in the large way. o2G. BP 
Localities of Minerals near West-Point, from Dr. Cutbush. 
— of Molybdenum, in granite and gneiss,’ West- 
Point, and Constitution Island, opposite the Point. 
Kalin, from decomposed feldspar, accompanying quartz. 
West-Poin 
Trenalite, glassy and fibrous, or aavereiort, in sienite. 
‘est 
Schorl in granite. -West-Point. 
Adularia in granite rock. _West-Poin 
Coccolite, Feet! Putnam, West-Poin, in wager This 
mineral I observed atais two years sin 
Garnets, common in gneiss, and jetbedded’ in mica slate. 
care t 
Precious Serpentine, Putnam County. This is Sietks- 
bly elegant The locality was first observed oe ge 
ouglass. 
Glassy Actynolite. Vicinity ns West-Point 
Magnetic iron ore. Constitut 
Vol. VIL—No. 1 
