CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
i ( 
D. Red soda-granite. Contains feldspar, quartz, chlorite, some mus- 
covite, rutile, leucoxene, hematite and apatite, \x\t\\ sometimes second- 
ary calcite. Granular variety. Analysis by W. F. Hillebrand, record 
No. 495. Dried at 110°. 
E. Same as D, porphyritic variety. Called by Bayley a quartz- 
keratophyre. Analysis by Hillebrand, record No. 497. 
F. Similar red porphyry, Little Brick Island, Lake Superior, near 
Pigeon Point. Consists chiefly of feldspar and quartz, with augite 
occasionally present. Analysis by L. G. Eakins, record No. 1059. 
G. Red feldspar, anorthoclase, separated from D. Contains hema- 
tite inclusions. Analysis by J. E. Whitfield, record No. 521. Dried 
at 104°. 
Si0 2 . 
A1A 
Fe 2 3 
FeO. 
MgO 
CaO. 
Na 2 
K,0. 
H 2 0. 
Ti0 2 . 
PA- 
MnO 
SrO. 
BaO. 
li 2 
CI... 
D. 
E. 
F. 
G. 
72.42 
74.00 
73.70 
65.00 
13.04 
12.04 
12.87 
18.22 
.68 
.78 
3.76 
2.64 
2.49 
.58 
2.61 
.42 
.31 
.11 
.06 
.66 
.85 
.14 
1.06 
3.44 
3.47 
3.63 
8.40 
4.97 
4.33 
4.56 
4.18 
1.21 
.86 
.57 
.46 
.40 
.20 
.09 
trace? 
.15 
trace? 
.34 
.06 
.05 
trace 
.12 
trace? 
.12 
trace 
.07 
trace 
trace 
100. 33 
99.93 
99.84 
100. 02 
