CLARKE.] 
IGNEOUS AND CRYSTALLINE ROOKS. 
NEW JERSEY. 
39 
Rocks A, B, and C, described by J. P. Iddings in Bull.'150, pp. 254, 
209, 236. Analyses by Eakins, record No. 1299. 
A. Basalt, Watchung Mountain, Orange, Contains pyroxene, mostly 
malacolite, plagioclase, magnetite, and glass, with variable amounts of 
serpentine or chlorite. The feldspar is partly altered into a mineral 
which is probably prehnite. P. R. C. 102. 
B. Elasolite-syeriite, Beemersville. Contains nephelite, orthoclase, 
segirite, and biotite, with melanite, sphene, apatite, zircon, and magne- 
tite in smaller amounts. Sodalite is probably present also. P. R. C. 78. 
C. Minette, Franklin Furnace. Contains alkali-feldspar, biotite, 
monoclinic pyroxene, magnetite, epidote, calcite, chlorite, apatite, 
sphene, pyrite, and a little secondary quartz. P. R. C. 91. 
D. Nepheline-syenite, Brookville. Collected by N. H. Darton and 
described by F. L. Ransome in Amer. Journ. Sci., 4th series, vol. 8, 
p. 117. Contains alkali-feldspars, nepheline largely altered to secondary 
minerals, brown amphibole, biotite, cancrinite, plagioclase, muscovite, 
segirine-augite, apatite, titanite, fluorite, and a few specks of mag- 
netite. Also secondary analcite, sericite, and natrolite (?). Analysis 
by Steiger, record No. 1807. 
A. 
B. 
c. 
D. 
Si0 2 
51.36 
16.25 
2.14 
8.24 
7.97 
10.27 
1.54 
1.06 
| 1.33 
53. 56 
24.43 
2.19 
1.22 
.31 
1.24 
6.48 
9.50 
| . 93 
40.71 
19.46 
7.46 
6.83 
6.21 
11.83 
1.80 
3.26 
| 1.53 
54.68 
21.63 
2.22 
2.00 
1.25 
2.86 
7.03 
4.58 
.27 
1.88 
.79 
.28 
trace 
A1 2 3 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 100° 
H 2 above 100° 
Ti0 2 .. 
P./V. 
MnO 
.09 
.03 
.10 
.18 
NiO 
BaO. 
.05 
.22 
.07 
none 
F _ 
SO, 
CO, . 
.74 
Less O— F. 
100. 28 
99.96 
100. 01 
99.81 
.09 
99.72 
