CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
NEW JERSEY. 
47 
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. Auvergnase. 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. Eheolite-syenite, Beemersville. Beemerose. Contains nephelite, 
orthoclase, regirite, and biotite, with melanite, sphene, apatite, zircon, 
and magnetite 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. Viezzenose. Collected by N. H. 
Darton and described by F. L. Ransome in Amer. Journ. Sci., 4th series, 
vol. 8, p. 417. 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 magnetite. Also secondary analcite, sericite, and natrolite (?). 
Analysis by Steiger, record No. 1807. P. R. C. 223. 
A. 
B. 
c. 
D. 
Si0 2 
51.36 
16. 25 
2.14 
8.24 
7.97 
10. 27 * 
1.54 
1. 06 
1 1. 33 
53.56 
24.43 
2.19 
1.22 
.31 
1.24 
6.48 
9.50 
} - 
40.71 
19.46 
7.46 
6.83 
6.21 
11. 83 
1.80 
3.26 
1 1 . 53 
54.68 
A1 2 3 '. 
21.63 
Fe 2 H 
2.22 
FeO 
2.00 
MgO 
1.25 
CaO 
2.86 
Na 2 
7.03 
K 2 
4.58 
H 2 at 100° 
.27 
H 2 above 100° 
1.88 
Ti0 2 
.79 
P 2 0, 
.28 
MnO 
.09 
.03 
.10 
.18 
trace 
NiO 
BaO 
.05 
F 
.22 
SO, 
.07 
co 2 
.74 
none 
Less O — F . 
100. 28 
99. 96 
100. 01 
99.81 
.09 
99.72 
