CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
69 
TENNESSEE. 
Gabbro, 2 miles south of Limestone Cove, Unieoi County. Camp- 
tonose. Collected by Arthur Keith, who furnishes the petrographic 
data. Analysis by W. F. Hillebrand, record No. 1707. Contains 
hypers thene, plagioclase, and magnetite. 
Si0 2 48. 11 
Al 2 H 14. 74 
FeA 2.54 
FeO 11 . 85 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 110° 
H 2 above 110° 
Ti0 2 
PA 
a Equivalent to 0.07 S 
5.10 
6.72 
2.92 
1.92 
9> 
Zr0 2 
CrA---- 
VA 
NiO, CoO 
MnO .... 
SrO 
BaO 
Li 2 
FeS 2 
^ i 
.... 1.73 
. . . . 3. 17 
44 
Assumed to be pyrite, no pyrrhotite being present. 
MISSOURI. 
(?) 
.01 
.03 
.03 
.19 
.02 
.04 
trace 
«. 13 
99.96 
Granite and porphyry, 6 miles east of Ironton. Described by 
Haworth in Missouri Geol. Survey, vol. 8, Annual Report, pp. 140, 
180, and 213. Analyses by W. H. Melville, record No. 1206. 
A, B. Granite, A, P. R. C. 1027; B, P. R. C. 1028. 
C, D. Porphyry. C, P. R. C. 1029; D, P. R.C. 1030. 
Rocks composed principally of orthoclase and quartz, with some 
microcline, plagioclase, and biotite, and minor accessory minerals. 
A is toscanose; B, C, and D are liparose. 
Si0 2 
A1A 
FeA 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 100°.... 
H 2 above 100° 
Ti0 2 
PA 
NiO 
MnO 
A. 
B. 
c. 
69. 94 
72. 35 
71.33 
15. 19 
13. 78 
1 2. 55 
1.88 
1.87 
3. 75 
.60 
.36 
.85 
.92 
.42 
.58 
1.15 
.87 
.1)4 
3.95 
4.44 
4.52 
4.29 
4.49 
4. 20 
.14 
.22 
.12 
.85 
.54 
. 30 
.25 
.44 
.13 
. L3 
.16 
trace 
.20 
. i:> 
.03 
. 06 
.04 
LOO. 04 
99.32 
li!). 87 
I). 
71.88 
12.88 
3.05 
1.05 
. 33 
1.13 
4.21 
4.46 
. 17 
.26 
.22 
.15 
.02 
trace 
99.81 
