QUARRIES IN KNOX COUNTY. 137 
blocks, but was reported as not in operation in 11)05 and was not 
visited by the writer. The product of this quarry is purchased by 
Booth Brothers & Hurricane Isle Granite Company. 
The Hurricane Island quarry is in the town of Vinalhayen, in the 
southeast part of Hurricane Island. (See map, fig*. 25.) Operator, 
Booth Brothers & Hurricane Isle Granite Company ; office, 207 Broad- 
way, New York, and Rockland, Me. 
The granite (specimen 4, a) is a biotite granite of general pinkish- 
feuff, medium-gray color, and of coarse, even-grained texture, the 
feldspars measuring up to three-fourths inch and the biotite scales up 
to two-tenths inch. It is identical with that of the Sands quarry, 
described on page 129. The potash feldspar is perhaps a trifle more 
pinkish buff than that of the Sands quarry, but not quite so much so 
as that of the Palmer quarry. These distinctions, however, arc small, 
and may not hold throughout the quarries, although they do charac- 
terize the typical specimens selected for the writer by the superin- 
tendents of the respective quarries. 
The folloAving chemical analysis of Hurricane Island granite was 
made by Ricketts & Banks, of New York, for the firm (No. 16073), 
and is inserted here for reference merely. 
Analysis of granite from Hurricane Island. 
Per cent. 
;Si0 2 (silica)__. 70. !)4 
A1 2 3 (alumina) 15.68 
FeO (ferrous oxide) 2.29 
CaO (lime) 1.23 
MgO (magnesia) : *_ 0. 19 
MnO (manganese oxide) 0.13 
Na 2 (soda) 
K 2 (potash) 
S (sulphur) total 
C0 2 (carbon dioxide) 
Loss and undetermined 
100. 00 
The following compression test was made by Prof. Ira H. Woolson, 
f the Columbia School of Mines. Ultimate crushing strength, 
19,583 pounds per square inch. 
The quarry, opened about 187G, measures. 500 feet along the rift 
(N. 85° W.) and has an average width of 150 feet. It lies on the 
south side of a ridge 100 feet high with a west-northwest to east- 
southeast axis. The greatest depth of working face is 105 feet, and 
its average is about 50 feet. The drainage is saved to supply the 
toilers. There is no stripping. 
3.58 
5.54 
0.05 
None. 
0.37 
a Published by William C. Day in Twentieth Ann. Rept. U. S. Geol. Survey, pt. 6 con 
inued, 1899, p. 391. (Test No. 1709.) 
