QUARRIES IN WASHINGTON COUNTY. 171 
The Minerva Cove quarry is in the town of Jonesport on the north 
side of Head Harbor Island, which lies about 3| miles southeast of 
Jonesport. Operator, Metropolitan Granite Company ; office, Jones- 
port, Me. 
The granite (specimens 88, <z, and 88, b) is a biotite granite which 
in the lower sheets is of general dark reddish-gray color, with both a 
pinkish and a greenish feldspar, but in the upper sheets has a white 
instead of a greenish feldspar. It is of coarse, even-grained texture, 
the feldspars measuring up to an inch in length and the biotite up to 
one-fifth inch. It consists, in descending order of abundance, of a 
pinkish potash feldspar (orthoclase with a little microcline), smoky 
quartz, a dull greenish or a milk-white soda-lime feldspar (oligoclase) 
and black mica (biotite) in conspicuous flakes, together with acces- 
sory magnetite, pyrite, titanite, and apatite. The orthoclase, generally 
in twins, is intergrown with a plagioclase. The oligoclase is largely 
altered to a white mica and kaolin, particularly in the upper sheets, 
where it has passed from green to a white. The quartz is cloiuty from 
the presence of multitudes of irregular bubbles, the i irgest of which 
me;) sure 0.01 mm, or about 0.0001 inch in length. It is also traversed 
by irregular fissures containing sericite* Some of the pinkish ortho- 
clase is rimmed with white or greenish oligoclase or completely envel- 
opes a greenish oligoclase crystal. The contrasts in the granite of the 
lower sheets are feeble, owing to the darkness of the oligoclase and 
quartz, but is marked in that of the upper sheets, the four minerals 
all differing in shade. 
The quarry consists of five openings: (1) 100 by 25 and 11 feet 
deep ; (2) 50 by 25 and 40 feet deep ; (3) 300 by 70 and 35 feet deep ; 
(4) triangular, 100 by 150 by 75 feet deep, with working face 35 feet 
high, and (5) 50 by 25 and 20 feet deep. In places there are 3 feet of 
" till " stripping. There is no drainage problem, but the opening at 
the wharf can be operated only at low tide. 
Kock structure : The sheets at the upper opening from 2 to 22 feet 
thick, but usually from 5 to 15 feet, dip 10° NE. Vertical joints 
striking N. 10° E. or north form a heading on the east and recur at 
intervals of 5 to 10 feet. Another set strikes east-west and dips 60° 
S., and one which may belong to it strikes N. 80° W., dips 90°. The 
rift is horizontal, the grain vertical, trending north-south. Dikes of 
aplite up to an inch thick have N. 60° E. courses. 
The plant consists of 3 derricks worked by horses. 
Transportation is effected by cartage of 700 feet and 50 feet down 
grade from upper opening to wharf. From the opening at the wharf 
stones are loaded by derricks directly on to schooners. 
The product is used for buildings and monuments. Specimen 
structures : Colorado Building, at Fourteenth and G streets, Washing- 
ton, D. C. ; State armory at Providence, K. L; power house of the 
