66 ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
KENTUCKY. 
1. ELLIOTT COUNTY DIKE. 
Described by Diller in Bull. 38. Also in Amer. Journ. Sci., 3d series, 
vol. 32, p. 125. 
A peridotite, var. kimberlite, consisting largely of olivine, sometimes 
altered to serpentine. Pyrope, ilmenite, a few scales of biotite, a little 
enstatite, and a trace of apatite are present as primary minerals. Sec- 
ondary minerals are serpentine, dolomite, magnetite, and octahedrite. 
A granitic rock occurs with the peridotite. It consists chiefly of 
feldspar, orthoclase, and plagioclase, with a considerable amount of 
quartz and ilmenite, and traces of hornblende, sphene, and apatite. 
Analyses by T. M. Chatard, record Nos. 272, 273, 282, 305, 351, 352, 
353, 354, and 358. 
A. Granite. Monzonose. 
B. Peridotite (kimberlite). P. R. C. 799. 
C. Olivine from peridotite. 
D. Garnet from peridotite. 
E. Ilmenite from peridotite. 
Si0 2 
A1 2 3 
FeA 
FeO 
MgO 
CaO 
Na 2 
K 2 
H,0 at 110° 
H 2 at ign . 
Ti0 2 
PA 
Cr 2 3 
MnO 
NiO 
CoO 
CO, , 
SO, 
60. 56 
L6. L9 
5.19 
2.41 
1 . 80 
2.09 
4.78 
4.82 
.51 
1.19 
..;o 
36 
99. 70 
66 
28 
100. 86 
40. 05 
.39 
2.36 
7.14 
46.68 
1.16 
.08 
.21 
.14 
.66 
.07 
.04 
.24 
.20 
trace 
(?) 
99. 42 
41.32 
21.21 
4.21 
7.93 
19.32 
4.94 
.07 
.17 
.16 
none 
.91 
.34 
100. 58 
.76 
2.84 
9.13 
27. 81 
8.68 
.23 
.19 
.20 
49.32 
trace 
.74 
.20 
100. 10 
I 
