ANALYSES OF IGNEOUS AND CRYSTALLINE ROCKS 
MAINE. 
1. ROCKS FROM AROOSTOOK COUNTY. 
Described by H. E. Gregory in Bull. 165. Analyses by W. F. Hillebrand, record 
No. 1795. . 
A. Quartz trachyte (bostonite), Quoggy Joe Mountain, Presque Isle Township. 
Liparose. Contains quartz, orthoclase, albite, and magnetite, with siderite, kaolin, 
and chlorite. 
B. Teschenite, Mapleton Township. Akerose. In dikes cutting shales. Contains 
andesine, augite, biotite, apatite, analcite, and magnetite. 
C. Andesite, Edmunds Hill, Chapman Township. Tonalose. Contains labradorite, 
orthoclase, pyroxene, apatite, and magnetite. 
D. Calciferous sandstone, New Sweden Township. Contains calcite, alkali feld- 
spar, quartz, magnetite, muscovite, and siderite. Included here because studied as 
one of the group. 
A B. Cc D 
46.77 | 61.40 54. 23 
14.91 | 16,59 7.38 
7. 80 2.13 54 
4,90 3.05 1.37 
2.94 2.73 3. 29 
6. 30 6.17 14. 56 
4.97 3. 83 1.65 
KOs sis cdncerste is sta siediantenictesalie roiarsineieeronenaisis cigshakaememane semiaaciesis 2.37 1.34 1.74 
H20 at 105°... .. -17 92 - 82 25 
55 4, 28 - 88 1.22 
TiOg. 20 2.31 -79 28 
POs. . trace 98 - 20 07 
ZrOa. 04} none | none 9 
OT Os eaerets aise Sa eWeek eet Oe i cedactnidietale 22 ceheee ese none | none | trace ? 
VG O aincxsttreencicmenscraianise s Se ceeennise Gon etna wed Mamie Sad Pale aeisssists (?) +02 - 02 2 
POG os ccscec ce ciecresencerneiae sin etaatnais senieain che ea nee Re ERemee SESS ERE SE: -12 -07 | none ? 
INI O ica capstone Se aee Rens Hoemtetealer stsasecenres reeeemmetiaS none | trace | trace none 
MnO 5.2 vasecesse eee 16 * -13 | undet. 
sro. none 03 | trace? none 
BaO 0 04 02 none 
COz. 2.06 | trace? | none 13. 48 
100. 09} 99.90 | 100.10 | 100.06 
Traces of lithia present in all. F and Cl not looked for. 
E. Diabase (basaltic glass), Mars Hill. Ornose. Not resolvable into minerals. 
F. Rhyolite, Haystack Mountain. Liparose. Contains quartz, albite, and ortho- 
clase, with sphene and accessory chlorite and kaolin. 
G. Volcanic tuff, southeast base of Castle Hill. Contains fragments of trachyte, 
andesite, devitrified glass, and lapilli. 
H. Diabase, Aroostook Falls, near Maine boundary line. Beerbachose. Dike. 
Contains plagioclase, pyroxene, pyrite, apatite, chlorite, and a little calcite. 
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