166 
CONTRIBUTIONS TO THE GEOLOGY OF MAINE. 
[BULL. 165. 
Analysis. — The following analysis (I) of the freshest material 
obtained was made by Dr. W. F. Hillebrand, of the United States 
Geological Survey: 
Analyses of quartz-trachytes and bostonites. 
Constituent. 
I. 
II. 
III. 
IV. 
V. 
VI. 
Si0 2 
Per cent. 
72.77 
12. 15 
.44 
3.06 
.22 
.07 
3.38 . 
4.67 
.17 
.55 
.20 
.04 
None. 
? 
None. 
.16 
.03 
None. 
? 
Trace. 
2.06 
9 
? 
t (.067 8) 
I .12 
Per cent. 
70.23 
15.00 
1.99 
Undet, 
.38 
.33 
4.98 
4.99 
.91 
1.28 
? . 03 
Per cent. 
69.00 
13.95 
1.56 
2.38 
.14 
.49 
5.67 
5.11 
} -™ 
.35 
Per cent. 
62.30 
17.05 
1.30 
2.46 
.57 
1.20 
5.14 
6.18 
.45 
Trace. 
Trace. 
Per cent. 
62.28 
19. 17 
3.39 
Per cent. 
72.88 
12.90 
.74 
1. 05 
.75 
.81 
3. 72 
5. 03 
1.22 
. 45 '' 
ALO, 
Fe 2 3 
FeO 
MgO 
Trace. 
1.44 
5.37 
5. 93 
2.33 
CaO 
Na 2 
K 2 
H 2 0— 105°.... 
H 2 O+105°.... 
Ti0 2 
Zr0 2 
Cr 2 3 
v 2 o 3 
NiO 
MnO 
.24 
.55 
.05 
BaO 
SrO 
LLO 
m 
P 2 5 
.06 
Trace. 
2. 65 
co 2 
CI 
Fl 
FeS 2 
Total 
.43 
100. 09 
100. 42 
99.95 
99.73 
99. 91 
99.60 
I. Quartz-trachyte, Quoggy Joe Mountain, Maine. Analysis by W. F. Hillebrand, United States 
Geological Survey. 
II. Bostonite (trachyte, keratophyre) , Marblehead Neck, Massachusetts. Analysis by T. M. Chatard. 
Sears, Bull. Museum Comp. Zool. Harvard Coll., Vol. XVI, No. 9, 1890, p. 170. 
III. Quartz-bostonite (quartzlindoite) Hof. Fron. Tartberg, Christiania, Norway. Analysis by U. 
Schmelck. Brogger, Eruptivegesteine des Kristianiagebietes, Grorudit-Tinguaite-Serie, p. 139. 
IV. Quartz-bostonite (linddit). Gj ef sen Kirchspiel Gran. Norway. Analysis by L. Schmelck. Brog- 
ger, Eruptivegesteine des Kristianiagebietes, Grorudit-Tinguaite-Serie, p. 139. 
V. Bostonite, Lake Champlain. Analysis by Kemp. Bull. U. S. Geol. Survey No. 107, 1893, p. '20. 
VI. Aplite-granite dike, Castle Mountain, Montana. Analysis by Pirsson. Weed and Pirsson, Bull. 
U. S. Geol. Survey No. 139, 1896, p. 96. 
Discussion of analysis. — This analysis shows some facts worthy of 
fuller mention. The carbonate present in such large quantity must 
