QUARRIES IN HANCOCK COUNTY. 95 
If all the C0 2 were allotted to CaO it would give 0.24 per cent of 
CaC0 3 (lime carbonate) as the content in the granite. 
The quarry, opened about 1875, measures 300 by 250 feet, and from 
15 to 35 feet in depth. It is drained by siphoning. The stripping 
consists of 3 feet of clay and bowlders. 
Rock structure: The sheets are from 6 to 7 feet thick and gen- 
erally dip northwest at low angles. There is some " toeing in," 
owing to the overlapping of lenses. Joint and vein courses are 
given in fig. 12. A forms a heading on the east side of quarry ; B is 
on the north and south sides and is coated with lime carbonate (cal- 
cite), as described on page 41. The heading on the south has four 
joints 3 feet apart. C is coated with pyrite, and hence is called by 
workmen the " iron seam." The .rift is horizontal and grain verti- 
cal cast-west. The sap measures from 1 to 3 inches in thickness. 
There are some knots up to 6 inches across. 
The plant consists of 2 derricks and siphon pipes. 
Transportation is effected by "lifters" drawn by horses 1,000 feet 
to schooners at dock. 
The product is used for curbing (both straight and circular) and 
paving in Boston, Philadelphia, and New York. 
F . Bradbury dfc Sons quarry is in West Franklin, near north end 
of Grape Pond; address. West Franklin. 
The granite (specimen 77, a) is a biotite granite of dark-grayish, 
lightly purplish color, Of very coarse, somewhat porphyritic tex- 
ture, with feldspars up to an inch in diameter and black mica plates 
up to one-tenth inch. It consists, in descending order of abundance, 
of a grayish-purplish potash feldspar (orthoclase and microcline), 
smoky quartz, yellowish-white soda-lime feldspar (basic oligoclase), 
and black mica (biotite), together with accessory magnetite, apatite, 
zircon, and secondary chlorite. Many of the grayish-purplish potash 
feldspars are rimmed with the yellowish oligoclase, and are also 
intergrown microscopically with a plagioelase feldspar and with 
quartz. This granite is very striking in the contrasts of its min- 
rals. Its quartz and feldspars take a high polish, but the large bio- 
tite scales are not favorable to the durability of the polish under out- 
door exposure. 
The quarry is triangular in area, each side of the triangle measur- 
ng about 75 feet, and its depth reaches in places 15 feet, which is the 
leight of the working face. 
Rock structure: The sheets are 10 feet thick and about horizontal, 
joints striking N. 70° W. and dipping high east recur at intervals of 
feet or more. There are a few knots. 
The plant consists of 2 derricks. 
Transportation is effected by cartage to railroad about 900 feet 
way. 
