438 Scientific Intelligence. 
a 
vein, The gangue is nearly an equal admixture ok sulphate 
of barytes and quartz; and galena and sulphuret of copper 
are disseminated through it in about the same, that is equal 
proportions. ‘The blende, which is of a yellowish aspect 
when the fractured crystal is beld in a certain position, ap- 
pears only occasionally. This vein is several feet wide, has 
been wrought to a small extent in two places, and its direc- 
tion is nearly north andsouth. It is on land of Mr. Field. 
Radiated quartz. In the above vein. A considerable ten- 
dency to crystallization appears at ihis place, not only in the 
quartz, but in the foliated structure ofthe barytes. 
Brownspar. Io the same place. But little of this mineral 
‘Was noticed. It exfoliated before the blowpipe, turned black, 
and became magnetic. 
3. Of Specular Oxide of Iron in Montague. 
_ Thisis found in a partially detached eminence, 100 feet 
high, near the north line of Montague, on land of Mr. Taft, a 
little southwest from the confluence of Miller’s river with the 
Connecticut. The whole hill, not less than 100 rods in cir- 
cumference at its base, is traversed by numerous veins of this 
ore; and scarcely a foot of the rock is to be seen that does 
not contain these, varying iwidthdrom a mere line to several 
inches. The principal vein appears on thé top “of the hill; 
and is as nearly as | could determine, not less than ten feet 
wide lying in a north and south direction. The ore seems 
tobe abundant, and generally pure. Masses that have been 
separated by blasting, and weighing from 100 to 200 pounds, 
lie on the surface. A small portion of sulphuret of iron 
was observed in some specimens. ‘The gangue is quartz, and 
the walls and hill granite. 
No opinion is here intended to be offered concerning the 
probable value of these ores, if worked. If they be useless 
to the present generation, they may not be so to some future 
one, when labour shall be cheaper; and therefore it was 
thought to be of some consequence to point out their localities. 
In the remarks, to which this paper is a supplement, blue 
quartz was inadvertently put down among the minerals found 
