84 
THE GRANITES OF MAINE. 
HANCOCK COUNTY. 
The granite quarries in Hancock County are in the towns of Blue- 
hill, Brooksville, Dedham, Franklin, Long Island, Mount Desert, 
Sedgwick, Stonington, Sullivan, Swans Island, and Tremont. 
The White quarry, in the town of Bluehill, 1} miles east of Blue- 
hill village. Operator, The White Granite Company, West avenue 
and Newton Creek, Long Island, N. Y. 
The granite (specimen 36, a) is a biotite granite of medium-gray, 
slightly bluish color and of coarse (on the medium side) even-grained 
texture. The feldspars measure as high as one-half inch, and some 
of them a little over. The rock consists, in descending order of 
abundance, of potash feldspar (microcline and orthoclase), smoky 
quartz, soda-lime feldspar (oligoclase), and black mica (biotite), 
Pig. 
-Structure at While quarry, 
Bluehill. T 
<!<>t ted lino. 
rectangular joint is shown by the 
together with accessory zircon and magnetite. The feldspar is 
slightly bluish. The contrast in shade betAveen the polished and 
rough surface is marked, but the mica plates are sufficiently large 
and numerous to prevent a perfect polish. Although the texture 
of this stone is coarsish, it is sufficiently fine to be well adapted 
for fluted columns and capitals. A test of its compressive strength 
made at the United States Arsenal at Watertown (test No. 0087, 
1893) gave an ultimate strength of l'9.420 pounds per square inch, 
the pressure being applied at right angles to the rift. A similar test 
made by the engineering department of the School of Mines of Colum- 
bia University, in New York, gave an ultimate strength of 29,081 
pounds. 
The quarry, opened about 1855., measures 300 by 350 feet and from 
15 to 45 feet in depth. The drainage that is not required for the 
boilers is effected by a channel to the harbor. There is no stripping. 
