PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 171 
haven, especially to the coarser variety from the ‘ Harbor Quarry.” 
Like the Vinalhaven rock, it too contains a small amount of hornblende, 
with zircon, apatite, sphene, and magnetite in microscopic proportions. 
The minute fluidal cavities in the quartz of this rock are often seen ar- 
ranged in regular wavy lines. <A single block now loosened from the 
quarry, 50 feet long by 40 feet deep and 25 feet wide, shows the immense 
masses in which this stone occurs. 
The Swanville granite is a very pretty, fine, dark-gray stone, so closely 
resembling the finer varieties from Vinalhaven that a special description 
is unnecessary. 
At South Thomaston two varieties of biotite granite are quarried. 
The one a dark-gray rock of medium fineness of texture, closely resem- 
bling the finer varieties of the Saint George rock and also that of Round 
Pond, in Lincoln County, in external appearance; the other a coarse 
gray rock containing large white feldspars and much mica in folia of 
considerable size. The finer variety contains, in microscopic crystals, 
microcline, muscovite, epidote, apatite, sphene, and magnetite, while 
the coarser differs in its lack of microcline and in containing small 
quantities of hornblende and pyrite. The variety from the locality 
known as Spruce Head, in spite of its coarse texture and abundant 
mInica, is said to weather well and hold its color most excellently. 
The Dix Island granite is a coarse, gray rock, containing scattering 
erystais of a flesh-colored feldspar. It contains a large proportion of 
quartz, and is consequently hard and rather brittle. A part of the feld- 
spar of this rock shows under the microscope the peculiar network struct- 
ure characteristic of microcline. Muscovite, epidote, sphene, and mag- 
netite are present in small proportions, visible only with the microscope. 
The Wayne granite is a coarse stone of quite uneven texture, con- 
taining large crystals of faintly flesh-colored orthoclase and an abundance 
of mica. Some hornblende is also present, which accounts for the name 
syenite as locally applied. The specimen received from this locality is 
rather below the average of the Maine granites. It is not extensively 
quarried. Its use is principally local. 
The Canaan granite is coarse, dark gray, and of rather uneven text- 
ure. It contains a large amount of black mica and scattering crystals 
of hornblende. It is not a handsome stone, although it works well and 
takes a good polish. It is used principally for underpinnings in the 
near vicinity. 
At Brunswick two varieties of granite, a coarse and a fine, are quarried 
on a small seale, principally for local use. The color of the finer variety 
is very uniform but of a slight yellowish cast on a polished surface. Both 
varieties coutain muscovite in considerable abundance. The finer stone 
from the quarry of N. Cripps has been used in the construction of the 
Bowdoin College chapel, First Parish church, Portland, and several 
other large builcings in the State. 
The granite quarried at Pownal is a beautiful, fine, even-grained gray 
