174 THE GRANITES OF MAINE. 
grown with plagioclase, the oligoclase is much altered to kaolin and 
a white mica, and the biotite is partly chloritized. Molybdenite 
occurs here and there. The granite is slightly less pinkish than thai 
from the quarry of Booth Brothers at Jonesboro (specimen 85, b). 
The contrasts are also reduced by the greater fineness of the particles.: 
It takes a fine polish, the durability of which is favored by the 
sparseness and smallness of the biotite scales. 
The quarry, opened in about L894, measures ^00 by 150 feet and 
from 2 to 10 feet in depth. There is no serious drainage problem 
and only 2 feel of -oil -tripping. 
Rock structure: The sheets, from 1 to 8 feet thick, dip irregularly 
as high as 10 S\V. and 10° NW. Vertical joints, striking N. 55° E.,. 
form headings on the north and south sides. Another set. striking 
X. 60° W., dips T0° SW. to 90°, forms headings near the east side,. 
and recurs at intervals of It) to 50 feet. A third and diagonal set, 
striking X. 85° E., dips 55° X. and recurs irregularly. There is 
some "toeing in" of sheets, probably owing to faulting along the 
set of joints striking X. 55 E. The faces of the second set are coated 
with epidote and those of the third with pyrite. The rift is horizon- 
tal. There are geodes (up to 6 inches thick) of orthoclase and 
oligoclase, smoky quartz, amethyst, and pyrite filled with calcite, 
epidote. and chlorite. Sap is 2 inches thick in the upper sheets only., 
The plant consists of 2 derricks ( 1 horse and 1 hand). 
Transportation is by cartage of :'> miles to railroad or wharf at; 
Machias. 
The product i< used for monuments and buildings and finds a mar- 
ket in the Middle West, Xew York, and Pennsylvania. Specimen 
building-: Basement front and steps of E. S. Draper residence, on 
Beacon street, Boston, Mass. In L905 the quarry was producing mora 
uments for local demand and for Boston. 
The Millbridge quarry is in the town of Millbridge, near Millbridge 
village, in i\w southwestern part of Washington County. Operators. 
Swanton & Wallace, Millbridge. Me. 
The granite (specimen 1 !•>. n) is a biotite granite of somewhat dark 
buff color and of medium, even-grained texture, with feldspars up tc 
three-tenths inch (exceptionally one-half inch) and biotite scalJ 
under one-tenth inch, consisting, in descending order of abundance. o1 
a buff-colored potash feldspar (orthoclase), smoky quartz, verti 
slight v greenish white soda-lime feldspar (oligoclase), and blaci 
mica (biotite), together with accessory magnetite and apatite. Tin 
quartz has numerous very irregular bubbles up to 0.028 millimetJ 
in length. The orthoclase is intergrown with a plagioclase. Grauu 
lation ("crush borders") occurs along the contacts of the feldspar: 
with one another. The stone takes a high polish, the durability o 
which is favored by the smallness of the biotite scales. 
