CLARKE.] 
IGNEOUS AND CKYSTALLINE ROCKS. 
59 
TENNESSEE. 
Gabbro, 2 miles south of Limestone Cove, Unicoi County. Col- 
lected by Arthur Keith, who furnishes the petrographic data. Analysis 
by W. F. Hillebrand, record No. 1707. Contains hypersthene. Dla- 
gioclase, and magnetite. 
Si0 2 
A1 2 3 
Fe 2 3 - 
FeO 
MgO 
CaO 
Na,0 
K 2 
H 2 OatllO° 
H 2 above 110° 
Ti0 2 
PA 
a Equivalent to 0.07 S. Assumed to be pyrite, no pyrrhotite being present. 
48.11 
14.74 
2.54 
11.85 
5.10 
6.72 
2.92 
1.92 
.27 
1.73 
3.17 
.44 
Zr0 2 .... 
Cr 2 3 --- 
VA-- 
NiO, CoO 
MnO.... 
SrO 
BaO 
Li 2 .... 
FeS 2 
(?) 
.01 
.03 
.03 
.19 
.02 
.04 
trace 
a. 13 
99. 96 
MISSOURI. 
Granite and porphyry, 6 miles east of Ironton. Described by 
Haworth in Mo. 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. 
