90 
THE GRANITES OF MATNE. 
clase crystals contain zona 
scales and arc sometimes t 
crushing 
The granite (specimen 108, a) is a biotite granite of dark-gray 
matrix with light-grayish feldspars and of very coarse porphyritic 
texture, with some evidence of distortion and crushing of its feld- 
spars. These measure up to H inches in diameter and the black 
mica up to three-tenths inch. The feldspars are generally twinned 
and often of oval or roundish outline. The rock consists, in descend- 
ing order of abundance, of potash feldspar (orthoclase and microcline) 
smoky quartz, soda-lime feldspar (oligoclase) and black mica (bio- 
tite), together with accessory zircon, apatite, and secondary magnetite 
and chlorite. The quartz contains needles of rutile (?). The ortho- 
y arranged quartz grains and biotite 
inly rimmed with oligoclase or inter- 
grown with it. Many small grains of quartz in the matrix indicate 
The oligoclase is partially altered to kaolin and a white 
mica. The rock takes a fine 
polish, but the durability of the 
polish under outdoor exposure 
is doubtful, owing to the large 
size of the mica scales. 
The quarry, opened in 1892, is 
200 feet north - northwest to 
south-southeast by 20 feet across 
and from 4 to 9 feet deep. The 
stripping consists of drift up to 
6 feet thick, but in places there 
is none. 
Rock structure: The sheets, 
from 2 to 6 feet thick, dip 15° 
SSE. Joint courses are given 
in fig. 8. A recur at intervals 
of 100 to 200 feet; B at inter- 
vals of 75 feet or more. The rift is horizontal. Aplite dikes, from 
1 to 4 inches thick, cross the grain at high angle. No knots are in 
sight. Sap, from 1 to 2 inches thick, is confined to the topmost sheet. 
The plant consists of 5 derricks, worked by horses and oxen, and 
1 engine. 
Transportation is had by cartage 1J miles to Ilolden station, where 
the cutting shed is. 
The product is used for bridge work. Contract in 1905: Maine 
Central Railroad bridge and station improvements at Bangor. 
The Robertson & Havey quarry in the town of Franklin, owned 
and operated by Robertson & Havey; address, North Sullivan. 
The granite (specimen 71, a) is a biotite granite of medium-gray 
shade and of coarse (inclining to medium), even-grained texture, 
with whitish feldspars up to one-half inch in diameter, consisting. 
Fig. 8.— Structure at Brown quarry, Dedhai 
