170 THE GRANITES OF MAINE. 
86, h, from the Bodwel] quarry, smoky quartz, cream-colored soda 
lime feldspar (oligoclase), and black mica (biotite), together with 
accessory magnetite and secondary white micas, zoisite, and chlorite 
The orthoclase is here and there intergrown with a plagioclase. The 
oligoclase is largely altered to a white mica and kaolin and the bio 
tite to chlorite. The contrasts are between the two feldspars and the 
smoky quartz. The stone takes a high polish, the durability of which 
is favored by the smallness of the biotite plates. Its general color 
is not quite so pinkish as that of the Bodwell quarry. 
The following chemical analysis of this granite was made by 
Ricketts & Banks, of New York (No. 16072), and is given herei 
merely for purpose of reference: 
Analysis <>f granite from Jonesboro quarry. 
SiO L , (silica) 72. !>< 
A1 2 3 (alumina) 14. 
FeO (ferrous oxide) 1.7c 
CaO (lime) 1. 4£ 
Mg< ) i magnesia) - <». '11 
MnO (manganese oxide) <>. 10 
Na 2 (soda) :\. 28 
K 2 (potash) r». 18 
S (sulphur) 0.01 
C0 2 (carbon dioxide) None. 
Loss and undetermined 0.33 
100.00 
The quarry is of triangular area, about 10 by 75 by 75 feet and 30 
feet deep. It is or can be drained by siphoning. The stripping com 
sists of 3 to 5 feel of till. 
Rock struct lire: The sheets, from 5 to 10 feet thick and lenticular, 
lie horizontal or dip 5° XW. or 5° SE. A vertical joint striking 
N. 60 AY. forms the wall on the southwest. A set striking X. 35°| 
50° E. forms heading- on the northwest and southeast and recurs 
at interval- of 5, 10, '20, and 70 feet. Its faces are coated with 
hematite. The rift is vertical, with course X. 60 c W. The grain is 
horizontal. Knots are small and infrequent. Sap up to 3 inches 
thick is confined to the headings. The structural conditions are 
favorable for quarrying large blocks. 
The plant consists of 1 derrick. 
Transportation is effected along a track one-third mile to wharf 
on Englishmans Bay. 
The quarry was idle in 1905. 
The product is shipped to the company's works on Hurricane Island 
to be finished and is used for building. 
