144 THE GRANITES OF MAINE. 
white soda-lime feldspar (oligoclase-andesine), black hornblende, 
quartz in amount almost, if not quite, equal to (hat of the horn- 
blende, black mica (biotite), and accessory magnetite, titanitl 
zircon, apatite, and secondary epidote. The stone takes a fair polish. 
The quarry, which was opened in 1885 for monumental work, con- 
sists of two adjacent openings, one 50 by 25 feet and up to 6 feet in 
depth; the other C>0 by 30 and 5 to 8 feet in depth, besides 4 feet o| 
clay loam stripping. 
Rock structure: The sheets, 3 to 8 I'cct thick, dip '25°-30° NE. 
Vertical or steep joints strike X. 10° W. and X. 42° W. The rift ia 
vertical with X". 10° W. course, and the grain is parallel to the sheets. 
The sap is 3 inches thick along the joints. There is one aplite dike <M 
to 4 inches thick. Biotite knots occur occasionally. 
The product is used for monuments locally. 
OXFORD COUNTY. 
The granite quarries in Oxford County are in the fcowms of Frye- 
burg, Oxford, and Woodstock. 
The Eagle Gray quarry is in the town of Fryeburg, at the north- 
easl fool <>f Starks Hill, about 1 j miles south of Fryeburg village 
Operator. Eagle Gray Granite Company, Fryeburg, Me. 
The granite (specimen L24, a) is a tnuscovite-biotite granite of gem 
eral medium even-grained texture, with feldspar one-fourth inch ii 
length and mica up to one-fifth inch. It consists, in descending or deif 
of abundance, of slightly cream colored potash feldspar (orthoclase) 
smoky quartz, slightly cream colored soda-lime feldspar (oligo< 
clase), white mica (muscovite), and black' mica (biotite). togethi 
with accessory garnel and zircon. The contrast- are chiefly betweq 
the cream-colored feldspar and the smoky quartz and the brilliann 
muscovite plates. The large size of the mica plates is unfavorable t» 
the durability of its polish under outdoor exposure. 
The quarry, opened in L903, is about 150 feet square by 3 to 1^ fee; 
deep. 
Rock .structure: The sheets, from 1 to 10 feet thick and becoming 
thicker southwest, dip less than 10 N"E. There are no joints, bit 
there are several pegmatite and diabase or basalt dikes. alreadJ 
referred to on page 45 and shown in fig. 31. These generally have i 
northwest-southeast course. The pegmatite is very coarse, affording 
incomplete crystals of orthoclase 1 foot long and biotite crystals | 
inches long. Mingled with the pegmatite are irregular bands of whi ■] 
ish garnetiferous aplite. The absence of joints and the abundance 1 (j 
dikes are the chief obstacles here. The rift is horizontal and marke-ll 
but there is no grain. Sap, one-half inch thick, is confined to the tc I 
sheet. 
