86 THE GRANITES OF MAINE. 
from the first two of these quarries. The product of the third was 
\\*(h\ only for doorsills, " platforms," and paving blocks. 
The Chase granite quarry is in the town of Bluehill, 3 miles easi 
of Bluehill Village, and north of Woods Point. Operator, Chase 
Quarries Company, 11 Broadway, New York. The quarries are not 
in operation at present. 
The granite (specimen 38, a) is a biotite granite of medium to 
light-gray shade and coarse, even-grained texture, the feldspars 
measuring up to 0.8 inches in length. It consists, in descending order 
of abundance, of potash feldspar (microcline and orthoclase), smoky 
quartz, soda-lime feldspar (oligoclase), and black mica (biotite), 
with accessory magnetite. The feldspars are milky white with a 
slight bluish tinge. The contrasts between the feldspar, quartz, and 
biotite are marked, more so than in the A\ nite quarry stone, because 
the feldspar is whiter, the quartz more smoky, and the biotite a trifle 
coarser. The following chemical analysis of this granite, made in 
1896 by Ricketts and Banks, of New York, is inserted here merely 
for reference : 
Ynalysis of granite from Chase granite quarry, near Bluehill, Me. 
SiO, (silica i __ T\.U2 
FeO (ferrous oxide) _ 2.59 
Al_.(), (alumina) __. _(>. 22 
MnO (manganous oxide) _____ Trace. 
CaO (lime) 0.94 
ATgO (magnesia I Trace] 
K,0 (potash i 3.42 
Na 2 (soda) 3. 6« 
S (sulphur) None. 
Loss and undetermined 0.2! 
The same firm also made a test of this granite (test No. L6606, 
1899) which showed that it has an ultimate compressive strength of 
23,400 pounds per square inch. 
The quarry, opened in 1872, consists of several openings on the to]) 
and eastern slope of a hill rising _?_!() feet above the sea in a distance 
of three-fourths mile. Drainage is effected by occasional use of 
siphon and pump. 
Rock structure: The sheets are up to 8 feet thick and either lie hori- 
zontal or dip at a low angle. Vertical joints strike N. 50° W. and 
X. 40° E. The rift is vertical, with a north strike. There are some 
small dikes of aplite and dark-gray knots. Sap occurs in the upper 
sheets to a thickness of several inches. In one of the openings the 
stone has occasional light rust spots half an inch in diameter, which 
are due to the oxidation of some ferruginous mineral in very minute 
particles. 
The plant consists of 9 derricks and 5 hoisting engines, 1 cable 
