98 
THE GRANITES OF MAINE. 
greenish, probably from presence of chlorite and epidote. Dark -gray 
knots measure up to 6 inches in diameter. 
The plant consists of 12 derricks, 12 hoisting engines, 1 hanging 
electric crane (capacity 15 tons), 1 locomotive, 2 compressors (ca- 
pacity 750 and 1,400 cubic feet per minute), 5 steam drills, 25 pneu- 
matic plug drills, 18 surfacers, and 36 pneumatic hand tools. 
Fig. 13. 
-Structure al McMullen quarry, Mounl Deserl Island. The section shows (he 
■• toeing in " of sheets, probably by faulting along the joints. 
Transportation is effected by track to wharf. 800 feet oft', which is 
accessible to schooners of 20 feet draft. 
The product is used for construct ion in New York and Washington. 
Specimen buildings made of this granite are the United States mint 
in Philadelphia, the basement of the New York custom-house, and the 
new bridge over the Potomac at Washington. Contracts in 1905: 
Brooklyn anchorage to Manhattan Bridge. 
The Campbell de Macomber quarry is in the town of Mount 
Desert, one-half mile north of top of Robinson mountain, at its foot, 
and two-fifths of a mile south. of "Hall Quarry" village. Ofhce 
address, Hall Quarry, Me. 
The granite (specimen 56, <?), known commercially as "Somes 
Sound Pink." is a biotite granite of light pinkish-gray color and 
medium, inclining to coarse, even-grained texture, consisting, in 
descending order of abundance, of a delicate pink potash feldspar 
(orthoclase, with very little microcline), smoky quartz, milk-white 
soda-lime feldspar (oligoclase), and black mica (biotite), together 
with accessory magnetite, zircon, and apatite. It takes a fine polish! 
This stone (lifters from the McMullen quarry stone in the tint of its 
orthoclase. 
The quarry, opened in about 1880, measures 150 by 200 feet by 20 
