CLARKE.] 
IGNEOUS AND CEYSTALLINE EOCKS. 
109 
Gr. Orthoclase-gabbro-diorite, rich in mica, Hurricane Ridge. And- 
ose. Contains orthoclase, plagioclase, quartz, biotite, aug'ite, hyper- 
sthene, magnetite, and hornblende. Analysis by Eakins, No. 1089. 
H. Another sample, like G. Andose. Same analyst and record 
number. 
I. Dioritic facies of gabbro, Hurricane Ridge. Andose. Very feld- 
spathic. Same analyst and number. 
J. Monzonite, Hurricane Ridge. Andose. Contains orthoclase, 
plagioclase, biotite, augite, hypersthene, and magnetite. Analysis 
by W. H. Melville, record No." 1233. 
K. Augite-andesite-porphyry. Andose. Intrusive sheet, Hurricane 
Ridge. Analysis by Eakins, No. 1088. Contains plagioclase, augite, 
hypersthene, magnetite, biotite, quartz, and microscopic orthoclase. 
Si0 2 .. 
A1A- 
FeA 
FeO.. 
MgO. 
CaO.. 
Na,0 . 
H 2 Oatl00°.... 
H 2 above 100° 
Ti0 2 
PA 
MnO 
NiO 
CI 
G. 
55. 93 
18.32 
2.39 
4.91 
3.97 
6.17 
4.29 
2.62 
.22 
.81 
.56 
.14 
100. 33 
n. 
56.21 
18.24 
3.26 
3.69 
3.38 
5.91 
4.15 
3.02 
ss 
64 
17 
I. 
100. 33 
57.26 
19.40 
2.49 
3.29 
2.57 
5.68 
4.21 
2.95 
.86 
.76 
.51 
.16 
J. 
57.32 
17.29 
3.89 
3.03 
3.56 
5.81 
3.89 
3.04 
.33 
.30 
.62 
.50 
.06 
.10 
100.14 , 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 
