CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
93 
G. Orthoclase-gabbro-diorite, rich in mica, Hurricane Ridge. Con- 
tains orthoclase, plagioclase, quartz, biotite, augite, hypersthene, mag- 
netite, and hornblende. Analysis b}^ Eakins, No. 1089. 
H. Another sample, like G. Same analyst and record number. 
I. Dioritic facies of gabbro, Hurricane Ridge. Very feldspathic. 
Same analyst and number. 
J. Monzonite, Hurricane Ridge. Contains orthoclase, plagioclase, 
biotite, augite, hypersthene, and magnetite. Analysis by W. H. Mel- 
ville, record number 1233. 
K. Augite-andesite-porphyry, intrusive sheet, Hurricane Ridge. 
Analysis by Eakins, No. 1088. Contains plagioclase, augite, hyper- 
sthene, magnetite, biotite, quartz, and microscopic orthoclase. 
Si0 2 . 
A1 2 3 
FeA 
FeO . 
MgO . 
CaO . 
Na 2 0. 
H 2 Oatl00°.... 
H 2 above 100° 
Ti0 2 
MnO 
NiO. 
CI... 
55. 93 
18.32 
2.39 
4.91 
3.97 
6.17 
4.29 
2.62 
.22 
.81 
.56 
.14 
100. 33 
56.21 
18.24 
3.26 
3.69 
3.38 
5.91 
4.15 
3.02 
.78 
.88 
.64 
.17 
100.33 
57.26 
19.40 
2.49 
3.29 
2.57 
5.68 
4.21 
2.95 
.86 
.76 
.51 
.16 
100. 14 
57.32 
17.29 
3.89 
3.03 
3.56 
5.81 
3.89 
3.04 
.33 
.30 
.62 
.50 
.06 
.10 
99.74 
K. 
57. 64 
18.43 
3.63 
2.84 
3.32 
5.49 
4.03 
3.33 
.51 
.77 
.34 
.10 
trace 
100. 43 
