154 THE GRANITES OF MAINE. 
The product is used for bridge work, and the small sheets ar| 
waste go into paving blocks. The chief markets arc New Yoi\ 
and Philadelphia. Specimen structures: The post-office at Lynj 
Mass.. and part of that at Chicago, 111.; the New York Central Rail 
road bridge across Harlem River. Contracts in L905 : The Man 
hattan anchorage of one of the new New York suspension bridges. 
The Mount Waldo quarry i< in the town of Frankfort, on th 
north spur of Mount Waldo, (';(';() feet above sea level, one-third mil 
southwest of Frankfort village. The geographical relations of Mel 
quito Mountain and Mount Waldo to the Penobscot River are show; 
on the Bucksport sheet of the United States Geological Survej 
topographic map of the United States, published in 1902. Thi 
quarry is operated by the Mount Waldo Granite Works, Albei 
Peirce, treasurer, Frankfort, Me. 
The granite (specimen 53, a) is a biotite granite of medium-grl 
shade and tine even-grained texture, with feldspar up to one-lift] 
inch and biotite scales up to one-tenth inch. The liner paiticl 
range from 0.36 to 1.4G millimeters in diameter It consists, i 
descending order of abundance, of gray potash feldspar (orthocli 
and microcline), smoky quartz, gray soda-lime feldspar (oligoclasJ 
and black mica (biotite), together with accessory magnetite, titanil 
and secondary chlorite The oligoclase is partly altered to kaofl 
and a white mica. A coarser and lighter granite (specimen 53, b 
from the same quarry is ;i biotite granite of light-gray shade am 
medium (inclining to line) even-grained texture, with feldspars u] 
to three-tenths inch, and biotite scales up to one-tenth inch, consist 
ing. in descending order of abundance, of white potash feldspa 
(orthoclase and microcline). smoky quartz, white soda-lime feldspa 
(oligoclase). and black mica (biotite). together with accessory mag 
netite, titanite, and secondary chlorite. The oligoclase is partiall 
altered to kaolin ami a white mica. Thi- variety i- in places coarsel 
porphyritic. Dr. George P. Merrill refers to the two Mount Wald 
granites/' A tesl of the compressive strength of Mount Waldo grar 
ite. made at the United Slate- arsenal at Watertown, Mass., in 190< 
yielded the following results with 2-inch cubes: 6 
"Collection of building and ornamental stones in the United States X.itimml Museun 
Ann. Kepi. Smithsonian Inst.. 1889, pi 2, \>. 115. 
Mteilly, J. W., Ordnance Kept., Tests of Metal, etc. (1900), 1901, p. 111). 
