16 Geology of Massachusetts. 
of Troy: and immense quantities have been obtained from this lo- 
cality. The large manufactories at Fall river are built of it, as is also 
Fort Adams at Newport, Rhode Island. The feldspar of this rock is 
a mixture of the flesh red and light, green varieties; the former pre- 
dominating: the quartz is light gray, and the mica, usually black. 
It works easily, and has a lighter and more lively appearanee than 
Quincy granite. Blocks of this granite have been split out from 
fifty to sixty feet long, as the sign-post at one of the public houses at 
Fall River, will attest: it consists of a single block. The contiguity 
of this granite to water transportation, will always render it peculiar- 
ly valuable. ' 
The granite range extending from Cohasset and Quincy, through 
Randolph, Stoughton, Foxborough, &c. into Rhode Island, affords. 
much valuable stone for architectural purposes; and it is wrought 
more or less in every town through which it passes. About two and 
a half miles to the west of Providence, (R. I.) it is quarried; and 
thence were obtained the beautiful and magnificent pillars in front of 
the Arcade in that place. 
That part of this extensive deposit of granite, which is fully devel- 
oped a little south west of Dedham, furnishes some beautiful varieties 
of stone. No better example can be referred to, than the elegant pil- 
lars of the Court House in Dedham. ‘This granite is very fine grain- 
ed, and so white, that at a short distance it cannot be distinguished 
from white marble. The pillars just named were obtained from some 
large bowlders near the dividing line between Dover and Medfeld. 
The stone used in Boston, under the name of Chelmsford granite, 
is found in a range of this rock, not connected with the deposit that 
has been described above. Nor does it come from Chelmsford ; but 
from Westford and Tyngsborough. In the latter place, it is obtained 
chiefly from bowlder stones; but ledges are quarried in Westford. E 
do not know why it has been called Chelmsford granite, unless from 
the fact that large quantities are carried to Lowell, (formerly a part. 
of Chelmsford,) to be wrought. ‘This rock is pure granite, with no: 
hornblende ; and being homogeneous and compact in its texture, it 
furnishes an elegant stone. Good examples of it may be seen in the 
pillars of the United States Bank, and in the Market House in Bos- 
ton. These were from Westford. 
Four miles north of Lowell, a quarry of this granite has been open- 
ed, in Pelham, (N. H.) Blocks may be obtained from this place of 
any length under thirty feet. It is a very fine variety, is much used, 
and appears superior to the Chelmsford granite. 
