104 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT 
CHEMICAL CHARACTERS. 
The foregoing relations, then, are almost wholly dependent on the chemical 
characters of the rocks, and are therefore expressed more exactly, although in a 
different light, in the following table of analyses. Tins is simply a compilation of 
the analyses appearing under each rock type, arranged approximately in the order 
of decreasing amounts of total alkalies, since these are the components which enter 
into orthoclase and analcite, the common minerals of the whole series, and which 
seem to constitute the most striking feature of the group. It is to be regretted 
that sufficient fresh material was not obtained for an analysis of the leucitophyre. 
It would probably correspond pretty closely with the phonolites, but would have 
an inverse ratio of potash to soda. 
Analyses of rocks from the Cripple Creek volcano. 
1. 
II. 
III. 
IV. 
V. 
VI. 
VII. 
VIII. 
IX. 
X. 
XI. 
XII. 
XIII. 
XIV. 
XV. 
XVI. 
SiC>2-... 
58.98 
58.78 
59.00 
58.64 
62.79 
59.38 
54. 43 
54.88 
54.34 
58.05 
56.01 
51.89 
49.84 
48.76 
47.31 
44.08 
AI2O3 — 
20.54 
20.03 
20.07 
19.62 
19.10 
19.47 
19.01 
18.53 
19.23 
17.66 
17.92 
17.94 
17. 78 
17.04 
16.21 
12.80 
Fe 2 C>3.. - 
1.65 
1.87 
1.58 
2.17 
2.29 
1.60 
2.85 
2.93 
3.19 
3.51 
4.20 
3.85 
5. 86 
5.04 
5.05 
4.58 
FeO.... 
.48 
.49 
.05 
.42 
.36 
1.19 
1.93 
1.92 
2.11 
1.65 
2.52 
3.37 
2.62 
3. 47 
2.90 
3. 72 
MgO.... 
.11 
.16 
.10 
.37 
.40 
.36 
.99 
1.26 
1.28 
1.55 
2.04 
2.88 
3.02 
4.57 
3.08 
7.22 
CaO.... 
.67 
83 
1.05 
1.24 
.87 
1.96 
4.33 
4.15 
4. 53 
4.48 
4.80 
5.62 
7.35 
8. 64 
7.11 
11.21 
Na 2 0...' 
9.95 
9.36 
8.34 
8.39 
6.23 
7.80 
6.92 
6.65 
6.38 
5.80 
4.92 
4.63 
5.20 
4. 27 
3.92 
2.97 
K 2 0.... 
5.31 
5.50 
5.63 
5.26 
5.58 
5.83 
5.07 
4.90 
5.14 
4.06 
4.21 
4.50 
3.04 
3.39 
3.73 
3. 31 
H 2 0- .. 
.19 
.31 
.24 
.34 
.25 
.11 
.31 
.38 
.14 
.35 
.31 
.72 
.34 
.69 
.87 
.77 
h 2 o+ . . 
.97 
1.57 
2.03 
2. 40 
.84 
.69 
1.68 
1.75 
1.17 
.87 
1.10 
2.09 
2.02 
1.84 
2.17 
2.35 
Ti0 2 .... 
.24 
.29 
.29 
.20 
.71 
.58 
.96 
.93 
1.09 
.91 
1.20 
1.34 
1.43 
1.34 
1.64 
1.43 
Zr0 2 .... 
.20 
.17 
.20 
.09 
.02 
.10 
.04 
.03 
.07 
.02 
.02 
.03 
.03 
Trace. 
.01 
None. 
C0 2 . 
.26 
.23 
Trace. 
. 14 
.13 
Trace. 
.52 
.22 
4.98 
4. 14 
P 2 Oo.... 
.04 
.03 
.05 
.03 
.12 
.08 
.25 
.27 
.27 
.40 
.55 
.67 
.76 
.79 
.90 
.70 
S0 3 . 
.20 
.12 
.07 
Trace. 
None. 
.37 
.42 
.36 
.07 
.04 
None. 
None. 
None. 
Trace. 
.05 
.01 
Cl. 
.28 
.58 
.24 
.14 
Trace. 
.22 
.22 
.14 
.28 
Trace. 
Trace. 
Trace. 
Trace. 
.01 
.05 
.04 
. 10 
.07 
. 10 
.04 
. 41 
. 11 
.12 
.26 
CroO't_ 
Trace? 
Trace? 
.05 
MnO.... 
.26 
.15 
.12 
.20 
.07 
.15 
.08 
.25 
.08 
.13 
.13 
.08 
.21 
.08 
Trace. 
.14 
BaO.... 
None. 
None. 
Trace. 
Trace. 
.14 
.13 
.21 
.18 
.24 
.19 
.16 
.19 
.22 
.15 
.17 
.13 
SrO. 
None. 
None. 
None. 
Trace. 
.03 
.03 
.21 
.11 
.16 
.08 
.06 
.11 
.18 
.07 
.02 
.06 
Li 2 0.... 
Trace. 
Trace. 
Trace. 
Trace. 
Trace. 
Trace. 
Trace. 
Trace. 
Trace. 
Trace. 
Trace. 
Trace. 
Trace. 
Trace 
100.07 
100. 24 
99.92 
99. 74 
100.05 
100.12 
99.85 
99.77 
100. 29 
99. 97 
Less 0 
for Cl. 
.07 
. 14 
.06 
.03 
.05 
.05 
0.3 
.07 
.01 
.01 
100.00 
100.10 
99.86 
99. 71 
99.90 
100.00 
100.07 
99.82 
99.70 
99.75 
100.19 
100.32 
100. 42 
100 48 
100.28 
99. 96 
I. Phonolite. 
II. Phonolite. 
III. Phonolite. 
IV. Phonolite. 
V. Biotite trachyte. 
VI. Latite-phonolite. 
VII. Latite-phonolite. 
VIII. Latite-phonolite. 
Miaskose.a 
Miaskose. 
Miaskose. 
Miaskose. 
Phlegrose.fc 
Miaskose. 
Essexose. 
Essexose. c 
Mitre Peak. 
Straub Mountain. 
Big Bull Mountain. 
Rhyolite Mountain. 
Portland mine. 
Buff Cliff. 
Bull Cliff. 
Portland mine. 
IX. Syenite. Akerose.d 
X. Latite-phonolite. Akerose. 
XI. Latite-phonolite. Akerose. 
XII. Syenite. Monzonose. 
XIII. Bull Cliff trachydolerite. Akerose. 
XIV. Isabella trachydolerite. Akerose.« 
XV. Vogesite. Monzonose. c 
XVI. Monchiquite. Ourose. 
Longfellow mine. 
Anaconda mine. 
Portland mine. 
Portland mine. 
Bull Cliff. 
Isabella mine. 
Jennie Sample mine. 
Block 8 mine. 
a According to the classification proposed by Cross, Iddings, Pirsson, and Washington, in “A Quantitative Classifica¬ 
tion of Igneous Rocks,” Chicago, 1903. 
i> On line between phlegrose and nordmarkose. 
c Near akerose. 
d Near essexose. 
«Near andose. 
