64 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
G. Orthoclase gabbro-diorite, rich in mica, Hurricane Ridge. Andose. Contains 
orthoclase, plagioclase, quartz, biotite, augite, hypersthene, magnetite, and horn- 
blende. 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 feldspathic. 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. 
L. Hornblende-mica andesite porphyry dike, ridge south of Hurricane Ridge. 
Tonalose. Contains plagioclase, hornblende, biotite, augite, hypersthene, and mag- 
netite, with a little chlorite or serpentine. Analysis by Eakins, No. 1087. 
M. Quartz diorite porphyry, Hurricane Ridge. Yellowstonose. Contains plagio- 
clase, orthoclase, quartz, augite, hypersthene, magnetite, and a little biotite. Analy- 
sis by Melville, No. 1234. 
N. Quartz-mica diorite, Hurricane Ridge. Adamellose. Contains andesine, ortho- 
clase, quartz, biotite, hornblende, magnetite, and a little pyroxene. Analysis by 
Melville, No. 1234. 
O. Quartz-mica diorite porphyry, Hurricane Ridge. Toscanose. Contains ande- 
sine, orthoclase, quartz, and biotite. Analysis by Melville, No. 1234. 
P. Aplite dike, Hurricane Ridge. Toscanose. Contains quartz, orthoclase, oligo- 
clase, biotite, magnetite, some chlorite, and a little hornblende. Analysis by Eakins, 
No. 1088. 
L. M N. ce) P. 
ROO eniesauxckie ta amnaemanksainusctineawaluhda dade dy ox poweneerenten 61.16 | 63.42] 63.97 | 64.40 1.62 
Al2O3 16.17 | 17.16] 15.78 | 15.77 14.99 
Fe203 2. 89 3.09 2. 35 2.47 1.27 
FeO 2.18 1.50 1.87 1,15 1.01 
MgO 3. 89 2. 64 2. 84 2.12 74 
CaO 4. 26 4.65 3.71 3. 54 1.33 
NazO 3. 87 4.51 4.36 4.10 3.62 
Ky se 3. 20 3.04 4.01 3. 81 4,81 
H20 at 100°....... ee = sei a 2.09 -16 -09 31 4 
poe shore ae = eins dente 2 . 28 -49 1.93 i 
